I get this error for any modpack using 1.15.X.
Game crashed
An unexpected issue occurred and the game has crashed. We're sorry for the inconvenience.
Exit Code: 0
This is from the crash log file
[main/FATAL]: Failed to find Minecraft resource version 1.15.2-20200515.085601 at C:\Users\XXX\Twitch\Minecraft\Install\libraries\net\minecraftforge\forge\1.15.2-31.2.36\forge-1.15.2-31.2.36-client.jar
I have 3 files in the directory above:
forge-1.15.2-31.2.36.jar
forge-1.15.2-31.2.36-clientdata.lzma
forge-1.15.2-31.2.36-universal.jar
