I am still having the issue as well. I am trying to create it for my son on a fresh install of minecraft.
Here are the results of the log:
JVM info: Oracle Corporation - 1.8.0_211 - 25.211-b12
java.net.preferIPv4Stack=true
Extracting json
Extracting json
Considering minecraft client jar
Considering minecraft client jar
Downloading libraries
Downloading libraries
Considering library net.minecraftforge:forge:1.14.3-27.0.25
File exists: Checksum validated.
Considering library org.ow2.asm:asm:6.2
File exists: Checksum validated.
Considering library org.ow2.asm:asm-commons:6.2
File exists: Checksum validated.
Considering library org.ow2.asm:asm-tree:6.2
File exists: Checksum validated.
Considering library cpw.mods:modlauncher:2.1.5
File exists: Checksum validated.
Considering library cpw.mods:grossjava9hacks:1.1.0
File exists: Checksum validated.
Considering library net.minecraftforge:accesstransformers:0.16.0-shadowed
File exists: Checksum validated.
Considering library net.minecraftforge:eventbus:0.10.3-milestone.0.1+1a5fa31-service
File exists: Checksum validated.
Considering library net.minecraftforge:forgespi:0.13.0
File exists: Checksum validated.
Considering library net.minecraftforge:coremods:0.6.3-milestone.0.4+c1d1f08
File exists: Checksum validated.
Considering library net.minecraftforge:unsafe:0.2.0
File exists: Checksum validated.
Considering library com.electronwill.night-config:core:3.6.0
File exists: Checksum validated.
Considering library com.electronwill.night-config:toml:3.6.0
File exists: Checksum validated.
Considering library org.jline:jline:3.9.0
File exists: Checksum validated.
Considering library org.apache.maven:maven-artifact:3.6.0
File exists: Checksum validated.
Considering library net.jodah:typetools:0.6.0
File exists: Checksum validated.
Considering library java3d:vecmath:1.5.2
File exists: Checksum validated.
Considering library org.apache.logging.log4j:log4j-api:2.11.2
File exists: Checksum validated.
Considering library org.apache.logging.log4j:log4j-core:2.11.2
File exists: Checksum validated.
Considering library net.minecrell:terminalconsoleappender:1.1.1
File exists: Checksum validated.
Considering library net.sf.jopt-simple:jopt-simple:5.0.4
File exists: Checksum validated.
Considering library com.github.jponge:lzma-java:1.3
File exists: Checksum validated.
Considering library com.google.code.findbugs:jsr305:3.0.2
File exists: Checksum validated.
Considering library com.google.code.gson:gson:2.8.0
File exists: Checksum validated.
Considering library com.google.errorprone:error_prone_annotations:2.1.3
File exists: Checksum validated.
Considering library com.google.guava:guava:20.0
File exists: Checksum validated.
Considering library com.google.guava:guava:25.1-jre
File exists: Checksum validated.
Considering library com.google.j2objc:j2objc-annotations:1.1
File exists: Checksum validated.
Considering library com.nothome:javaxdelta:2.0.1
File exists: Checksum validated.
Considering library commons-io:commons-io:2.4
File exists: Checksum validated.
Considering library de.oceanlabs.mcp:mcp_config:1.14.3-20190624.152911@zip
File exists: Checksum validated.
Considering library net.md-5:SpecialSource:1.8.5
File exists: Checksum validated.
Considering library net.minecraftforge:binarypatcher:1.0.5
File exists: Checksum validated.
Considering library net.minecraftforge:forge:1.14.3-27.0.25:universal
File exists: Checksum validated.
Considering library net.minecraftforge:installertools:1.1.4
File exists: Checksum validated.
Considering library net.minecraftforge:jarsplitter:1.1.0
File exists: Checksum validated.
Considering library net.sf.jopt-simple:jopt-simple:4.9
File exists: Checksum validated.
Considering library net.sf.jopt-simple:jopt-simple:5.0.4
File exists: Checksum validated.
Considering library net.sf.opencsv:opencsv:2.3
File exists: Checksum validated.
Considering library org.checkerframework:checker-qual:2.0.0
File exists: Checksum validated.
Considering library org.codehaus.mojo:animal-sniffer-annotations:1.14
File exists: Checksum validated.
Considering library org.ow2.asm:asm-analysis:6.1.1
File exists: Checksum validated.
Considering library org.ow2.asm:asm-commons:6.1.1
File exists: Checksum validated.
Considering library org.ow2.asm:asm-tree:6.1.1
File exists: Checksum validated.
Considering library org.ow2.asm:asm:6.1.1
File exists: Checksum validated.
Considering library trove:trove:1.0.2
File exists: Checksum validated.
Created Temporary Directory: C:\Users\Bryan\AppData\Local\Temp\forge_installer8857184139122708426
Created Temporary Directory: C:\Users\Bryan\AppData\Local\Temp\forge_installer8857184139122708426
Extracting: /data/client.lzma
Building Processors
Building Processors
===============================================================================
MainClass: net.minecraftforge.installertools.ConsoleTool
Classpath:
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\minecraftforge\installertools\1.1.4\installertools-1.1.4.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\md-5\SpecialSource\1.8.5\SpecialSource-1.8.5.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\5.0.4\jopt-simple-5.0.4.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.8.0\gson-2.8.0.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-commons\6.1.1\asm-commons-6.1.1.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\20.0\guava-20.0.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\sf\opencsv\opencsv\2.3\opencsv-2.3.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-analysis\6.1.1\asm-analysis-6.1.1.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-tree\6.1.1\asm-tree-6.1.1.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm\6.1.1\asm-6.1.1.jar
Args: --task, MCP_DATA, --input, C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.14.3-20190624.152911\mcp_config-1.14.3-20190624.152911.zip, --output, C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.14.3-20190624.152911\mcp_config-1.14.3-20190624.152911-mappings.txt, --key, mappings
Task: MCP_DATA
Input: C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.14.3-20190624.152911\mcp_config-1.14.3-20190624.152911.zip
Output: C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.14.3-20190624.152911\mcp_config-1.14.3-20190624.152911-mappings.txt
Key: mappings
Extracting: config/joined.tsrg
===============================================================================
Cache:
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\minecraft\client\1.14.3\client-1.14.3-slim.jar Validated: 26e8580ce23d59759c2db41756a834a6df292313
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\minecraft\client\1.14.3\client-1.14.3-extra.jar Validated: e0a45cca33d23f63b149b4546978ee0e4d858167
Cache Hit!
===============================================================================
MainClass: net.md_5.specialsource.SpecialSource
Classpath:
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\md-5\SpecialSource\1.8.5\SpecialSource-1.8.5.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-commons\6.1.1\asm-commons-6.1.1.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.9\jopt-simple-4.9.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\20.0\guava-20.0.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\sf\opencsv\opencsv\2.3\opencsv-2.3.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-analysis\6.1.1\asm-analysis-6.1.1.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-tree\6.1.1\asm-tree-6.1.1.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm\6.1.1\asm-6.1.1.jar
Args: --in-jar, C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\minecraft\client\1.14.3\client-1.14.3-slim.jar, --out-jar, C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\minecraft\client\1.14.3-20190624.152911\client-1.14.3-20190624.152911-srg.jar, --srg-in, C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.14.3-20190624.152911\mcp_config-1.14.3-20190624.152911-mappings.txt
Loading mappings
Loading mappings... 0%
Loading mappings... 10%
Loading mappings... 20%
Loading mappings... 30%
Loading mappings... 40%
Loading mappings... 50%
0 packages, 4696 classes, 17220 fields, 31208 methods
Remapping final jar
Remapping jar... 0%
Remapping jar... 10%
Remapping jar... 20%
Remapping jar... 30%
Remapping jar... 40%
Remapping jar... 50%
Remapping jar... 60%
Remapping jar... 70%
Remapping jar... 80%
Remapping jar... 90%
Remapping jar... 100%
===============================================================================
Cache:
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\minecraftforge\forge\1.14.3-27.0.25\forge-1.14.3-27.0.25-client.jar Validated: 06966241be40e8da12945e459d654c2e10570ad4
Cache Hit!
===============================================================================
MainClass: net.minecraftforge.installertools.ConsoleTool
Classpath:
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\minecraftforge\installertools\1.1.4\installertools-1.1.4.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\md-5\SpecialSource\1.8.5\SpecialSource-1.8.5.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\5.0.4\jopt-simple-5.0.4.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.8.0\gson-2.8.0.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-commons\6.1.1\asm-commons-6.1.1.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\20.0\guava-20.0.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\net\sf\opencsv\opencsv\2.3\opencsv-2.3.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-analysis\6.1.1\asm-analysis-6.1.1.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-tree\6.1.1\asm-tree-6.1.1.jar
C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm\6.1.1\asm-6.1.1.jar
Args: --task, DEOBF_REALMS, --map, C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.14.3-20190624.152911\mcp_config-1.14.3-20190624.152911-mappings.txt, --mc, C:\Users\Bryan\AppData\Roaming\.minecraft\versions\1.14.3\1.14.3.jar, --mcp, 20190624.152911
Task: DEOBF_REALMS
Jar: C:\Users\Bryan\AppData\Roaming\.minecraft\versions\1.14.3\1.14.3.jar
Map: C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.14.3-20190624.152911\mcp_config-1.14.3-20190624.152911-mappings.txt
MCP: 20190624.152911
Json: C:\Users\Bryan\AppData\Roaming\.minecraft\versions\1.14.3\1.14.3.json
Libs: C:\Users\Bryan\AppData\Roaming\.minecraft\libraries
Loading Json: C:\Users\Bryan\AppData\Roaming\.minecraft\versions\1.14.3\1.14.3.json
Scanning Libraries:
com.mojang:patchy:1.1
oshi-project:oshi-core:1.1
net.java.dev.jna:jna:4.4.0
net.java.dev.jna:platform:3.4.0
com.ibm.icu:icu4j-core-mojang:51.2
com.mojang:javabridge:1.0.22
net.sf.jopt-simple:jopt-simple:5.0.3
io.netty:netty-all:4.1.25.Final
com.google.guava:guava:21.0
org.apache.commons:commons-lang3:3.5
commons-io:commons-io:2.5
commons-codec:commons-codec:1.10
net.java.jinput:jinput:2.0.5
net.java.jutils:jutils:1.0.0
com.mojang:brigadier:1.0.17
com.mojang:datafixerupper:2.0.24
com.google.code.gson:gson:2.8.0
com.mojang:authlib:1.5.25
org.apache.commons:commons-compress:1.8.1
org.apache.httpcomponents:httpclient:4.3.3
commons-logging:commons-logging:1.1.3
org.apache.httpcomponents:httpcore:4.3.2
it.unimi.dsi:fastutil:8.2.1
org.apache.logging.log4j:log4j-api:2.8.1
org.apache.logging.log4j:log4j-core:2.8.1
com.mojang:realms:1.14.17
Downloading library from https://libraries.minecraft.net/com/mojang/realms/1.14.17/realms-1.14.17.jar
java.nio.file.NoSuchFileException: C:\Users\Bryan\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.14.17\realms-1.14.17.jar
at sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(Unknown Source)
at java.nio.file.spi.FileSystemProvider.newOutputStream(Unknown Source)
at java.nio.file.Files.newOutputStream(Unknown Source)
at java.nio.file.Files.copy(Unknown Source)
at net.minecraftforge.installertools.DeobfRealms.download(DeobfRealms.java:175)
at net.minecraftforge.installertools.DeobfRealms.process(DeobfRealms.java:126)
at net.minecraftforge.installertools.ConsoleTool.main(ConsoleTool.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraftforge.installer.actions.PostProcessors.process(PostProcessors.java:227)
at net.minecraftforge.installer.actions.ClientInstall.run(ClientInstall.java:142)
at net.minecraftforge.installer.InstallerPanel.run(InstallerPanel.java:428)
at net.minecraftforge.installer.SimpleInstaller.launchGui(SimpleInstaller.java:166)
at net.minecraftforge.installer.SimpleInstaller.main(SimpleInstaller.java:139)
Failed to download realms jar
Failed to run processor: java.lang.RuntimeException:Failed to download realms jar
See log for more details.