Hello @pappasa
There are parts of this library which will not port over to .NET 5 which is mentioned in the first link e.g. System.EnterpriseServices. This means your choice is to look for alternate code for System.EnterpriseServices or don't move forward with the migration to .NET 5.
See .NET Framework technologies unavailable on .NET Core and .NET 5+ then Overview of porting from .NET Framework to .NET Core.