I've been trying to install Forge on my PC nearly all day, and I've gone through all of the bug fixes for this issue already. Whenever I start installing Forge, it comes up with the error message "Downloading minecraft server failed, invalid e-tag checksum. Try again, or manually place server jar to skip download." If I hit the OK button it just shows the progress bar at 0 and it doesn't move after that. I tried installing older versions of Forge, downloading and running the .jar version of the installer, and changing the destination folder and nothing has worked so far. It is able to create a single empty "Library" folder, but that's it. In my downloads folder, it creates a text document that reads

 

Considering minecraft server jar
Downloading minecraft server version 1.12.2
java.net.SocketTimeoutException: Read timed out
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.socketRead(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at sun.security.ssl.InputRecord.readFully(Unknown Source)
    at sun.security.ssl.InputRecord.readV3Record(Unknown Source)
    at sun.security.ssl.InputRecord.read(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.readDataRecord(Unknown Source)
    at sun.security.ssl.AppInputStream.read(Unknown Source)
    at java.io.BufferedInputStream.fill(Unknown Source)
    at java.io.BufferedInputStream.read1(Unknown Source)
    at java.io.BufferedInputStream.read(Unknown Source)
    at sun.net.www.MeteredStream.read(Unknown Source)
    at java.io.FilterInputStream.read(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Unknown Source)
    at com.google.common.io.ByteStreams.copy(ByteStreams.java:207)
    at com.google.common.io.ByteSource.copyTo(ByteSource.java:204)
    at com.google.common.io.Files.copy(Files.java:382)
    at net.minecraftforge.installer.DownloadUtils.downloadFileEtag(DownloadUtils.java:174)
    at net.minecraftforge.installer.ServerInstall.run(ServerInstall.java:53)
    at net.minecraftforge.installer.InstallerAction.run(InstallerAction.java:43)
    at net.minecraftforge.installer.InstallerPanel.run(InstallerPanel.java:406)
    at net.minecraftforge.installer.SimpleInstaller.launchGui(SimpleInstaller.java:165)
    at net.minecraftforge.installer.SimpleInstaller.main(SimpleInstaller.java:51)
 

 

 

Do what it's telling you to do download the Minecraft server jar for your version and put it in the folder. You may have to rename it to 'minecraft_server.1.12.2.jar' so forge is happy.