If you get an error about "Downloading Minecraft server failed, invalid e-tag checksum.", you will need to install a vanilla Minecraft server and then run Forge installer. The vanilla server can be downloaded in its respective page.
If you get an error about "Downloading Minecraft server failed, invalid e-tag checksum.", you will need to install a vanilla Minecraft server and then run Forge installer. The vanilla server can be downloaded in its respective page.