(probably someone from Appeon should answer this question)
On your website "Installation Guide of SnapDevelop (PB Edition) 2019" you have listed this as requirements:
Microsoft .NET Framework 4.6.1 SDK
Microsoft .NET Core SDK 2.1.6
What's your plan to support the latest versions of .NET in SnapDevelop?
Looking at the Microsoft website the latest versions are .NET Core 3.0 and .NET Framework 4.8.
They are supported by the latest version of Visual Studio.
Obviously I understand that it may take longer for you to do the same with SnapDevelop but it would be good to know what's your plan to keep it up to date.