I have been messing with trying to install the obsolete packages plugin for 2 days now - no luck - can you tell from the error log what's wrong:
Message: BepInEx] BepInEx 5.4.21.0 - VaM (6/27/2020 3:08:09 PM)
[Info : BepInEx] Running under Unity v2018.1.9.2407384
[Info : BepInEx] CLR...