Hi @Tom_P,
Plug-ins installed from the Package Manager or by dragging and dropping a .yak package are not automatically migrated.
Also, a plug-in’s OnLoad member can check the version of Rhino that is loading and refuse to load if needed by returning a value other than LoadReturnCode.Success.
I believe there is a special registry setting that will prevent plug-ins from being migrated. I’ll have to look into this more.
– Dale