'CompilerContext' is inaccessible due to its protection level in Unity 2020.1.2f1

[omundy]

I installed (dragged into Assets) in Unity 2020.1.2f1 and received the following errors

Assets/UnityShell/Editor/Scripts/ShellEvaluator.cs(27,34): error CS0122: 'CompilerContext' is inaccessible due to its protection level

Assets/UnityShell/Editor/Scripts/ShellEvaluator.cs(27,54): error CS0122: 'CompilerSettings' is inaccessible due to its protection level

Assets/UnityShell/Editor/Scripts/ShellEvaluator.cs(27,78): error CS0122: 'ConsoleReportPrinter' is inaccessible due to its protection level

Assets/UnityShell/Editor/Scripts/ShellEvaluator.cs(27,20): error CS1729: 'Evaluator' does not contain a constructor that takes 1 arguments

[iamabigartist]

I use 2020.3.25f1 :

1. I use the original 4.x.dll.
2. Delete the 3.5.dll for ambiguous reference.
3. Select the 4.x.dll and Set "platforms for plugins" for all platforms.
4. Then it should work.