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Summary
When starting the Performer Suite an error could occur.
Error
System.MissingMethodException: Method not found: '!!0[] System.Array.Empty()'.
Cause
Your .NET Framework version is too low. It is needed to display the graphic interface of the Performer Suite.
Solution
Install .NET Framework 4.8 (4.8.1 is not recommended)
Download: https://dotnet.microsoft.com/en-us/download/dotnet-framework
Further information
Want to find out which .NET version you have installed?
https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-determine-which-versions-are-installed