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
Further information
Install guide: https://docs.microsoft.com/en-us/dotnet/framework/install/
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