[BUG] Installer crash, System.IO.FileNotFoundException on Ubuntu 21.10 w/ Proton 5.0-10

[nothjarnan]

Describe the bug
The installer crashes when running it on Proton v5.0-10. A window pops up saying that the program has crashed.

To Reproduce
Steps to reproduce the behavior:

1. Following this tutorial
2. Launch the Installer with the following command:
   STEAM_COMPAT_DATA_PATH="$MSCCOMPATDIR" WINEPREFIX="$MSCCOMPATDIR/pfx" "$PROTONDIR/proton" run ./Installer.exe

Expected behavior
The modloader will fail to install successfully, instead crashing upon startup but the installer window still appearing. Attempting to continue with the installation will not work.

Screenshots

output_log.txt
There is no output_log.txt, the game still functions normally since the modloader failed to install.

Additional context
OS: Ubuntu 21.10 64-bit
Kernel: 5.13.0-35-generic
Proton: 5.0-10

[nothjarnan]

Update: I saw the alternative to use an archive. I'll leave this up though, as it could be nice to have a fix for this if applicable.