I have a problem installing Forge on MC 1.5.2, it seems that it's looking for files to download that aren't there. I went to the directory where it downloads them ( the fmlibs folder ) and the files are there, just not the versions it's looking for. Here's my crash log:

 

 

2014-03-23 16:52:52 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.2.23.738 for Minecraft 1.5.2 loading
2014-03-23 16:52:52 [iNFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.7.0_45, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre7
2014-03-23 16:52:52 [FINE] [ForgeModLoader] Java classpath at launch is C:/Users/Mark LaDoux/Desktop/MultiMC/jars/NewLaunch.jar
2014-03-23 16:52:52 [FINE] [ForgeModLoader] Java library path at launch is C:\Program Files\Java\jre7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Python33\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Perl\bin\;C:\Program Files (x86)\Windows Live\Shared;C:\HashiCorp\Vagrant\bin;.
2014-03-23 16:52:52 [FINE] [ForgeModLoader] Enabling runtime deobfuscation
2014-03-23 16:52:52 [FINEST] [ForgeModLoader] All core mods are successfully located
2014-03-23 16:52:52 [FINEST] [ForgeModLoader] Discovering coremods
2014-03-23 16:52:52 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/argo-small-3.2.jar
2014-03-23 16:52:52 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/argo-small-3.2.jar
2014-03-23 16:52:52 [FINEST] [ForgeModLoader] Download complete
2014-03-23 16:52:52 [iNFO] [ForgeModLoader] Download complete
2014-03-23 16:52:52 [FINEST] [ForgeModLoader] Library file argo-small-3.2.jar was downloaded and verified successfully
2014-03-23 16:52:52 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2014-03-23 16:52:52 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2014-03-23 16:52:54 [FINEST] [ForgeModLoader] Download complete
2014-03-23 16:52:54 [iNFO] [ForgeModLoader] Download complete
2014-03-23 16:52:54 [FINEST] [ForgeModLoader] Library file guava-14.0-rc3.jar was downloaded and verified successfully
2014-03-23 16:52:54 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2014-03-23 16:52:54 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2014-03-23 16:52:54 [FINEST] [ForgeModLoader] Download complete
2014-03-23 16:52:54 [iNFO] [ForgeModLoader] Download complete
2014-03-23 16:52:54 [FINEST] [ForgeModLoader] Library file asm-all-4.1.jar was downloaded and verified successfully
2014-03-23 16:52:54 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2014-03-23 16:52:54 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] There was a problem downloading the file bcprov-jdk15on-148.jar automatically. Perhaps you have an environment without internet access. You will need to download the file manually or restart and let it try again

2014-03-23 16:52:54 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.2.zip
2014-03-23 16:52:54 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.2.zip
2014-03-23 16:52:54 [FINEST] [ForgeModLoader] Download complete
2014-03-23 16:52:54 [iNFO] [ForgeModLoader] Download complete
2014-03-23 16:52:54 [FINEST] [ForgeModLoader] Library file deobfuscation_data_1.5.2.zip was downloaded and verified successfully
2014-03-23 16:52:54 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/scala-library.jar
2014-03-23 16:52:54 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/scala-library.jar
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] There was a problem downloading the file scala-library.jar automatically. Perhaps you have an environment without internet access. You will need to download the file manually or restart and let it try again

2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] There were errors during initial FML setup. Some files failed to download or were otherwise corrupted. You will need to manually obtain the following files from these download links and ensure your lib directory is clean. 
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/argo-small-3.2.jar
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/guava-14.0-rc3.jar
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/asm-all-4.1.jar
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.2.zip
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/scala-library.jar
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] <===========>
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] The following is the errors that caused the setup to fail. They may help you diagnose and resolve the issue
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] A download error occured
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] A download error occured
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] <<< ==== >>>
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] The following is diagnostic information for developers to review.
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] Error details
java.lang.RuntimeException: A download error occured
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:548)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:165)
at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)
at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)
at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)
at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
at net.minecraft.Launcher.init(Launcher.java:108)
at org.multimc.legacy.LegacyFrame.start(LegacyFrame.java:66)
at org.multimc.legacy.LegacyLauncher.launch(LegacyLauncher.java:158)
at org.multimc.EntryPoint.listen(EntryPoint.java:139)
at org.multimc.EntryPoint.main(EntryPoint.java:53)
Caused by: java.io.FileNotFoundException: http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:532)
... 10 more
Caused by: java.io.FileNotFoundException: http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-148.jar
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)
at java.net.URLConnection.getHeaderFieldLong(Unknown Source)
at java.net.URLConnection.getContentLengthLong(Unknown Source)
at java.net.URLConnection.getContentLength(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:531)
... 10 more
2014-03-23 16:52:54 [sEVERE] [ForgeModLoader] Error details
java.lang.RuntimeException: A download error occured
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:548)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:165)
at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)
at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:259)
at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:229)
at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
at net.minecraft.Launcher.init(Launcher.java:108)
at org.multimc.legacy.LegacyFrame.start(LegacyFrame.java:66)
at org.multimc.legacy.LegacyLauncher.launch(LegacyLauncher.java:158)
at org.multimc.EntryPoint.listen(EntryPoint.java:139)
at org.multimc.EntryPoint.main(EntryPoint.java:53)
Caused by: java.io.FileNotFoundException: http://files.minecraftforge.net/fmllibs/scala-library.jar
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:532)
... 10 more
Caused by: java.io.FileNotFoundException: http://files.minecraftforge.net/fmllibs/scala-library.jar
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)
at java.net.URLConnection.getHeaderFieldLong(Unknown Source)
at java.net.URLConnection.getContentLengthLong(Unknown Source)
at java.net.URLConnection.getContentLength(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:531)
... 10 more

 

I actually fixed this by copying the lib files from a 1.5.2 version of FTB. I was just upset that I couldn't get them from mcforge directly.