Summary
When starting the Performer Suite an error could occur.
Error
System.MissingMethodException: Method not found: '!!0[] System.Array.Empty()'.
Cause
.NET 4.6.1 is needed to display the graphic interface of the Performer Suite.
Solution
Install the latest .NET Framework.
Download: https://dotnet.microsoft.com/download/dotnet-framework/
.NET 4.8.x is the topmost entry in the table that follows. Which means that once it's installed, you can't /don't need to install 4.6 (any variant)
Do you want to know which .NET version you have installed? Please check the link below:
https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-determine-which-versions-are-installed