I had  downloaded the install file for Plarium Play. Previously a few months back I was able to use  ProtonPlus on Linux Mint and install and run the launcher AND the game without any problems. So this is using Mono for the .NET implementation.

Now I go to install it and I keep getting a failure to install and  it points to something (possibly you just began using) in .NET that is  failing but I cannot get any traces to find out the point  it failed and the call being made.