Hi @siemen, do still have an older compiler or the one which you used initially to compile your PlugIn the first time ?
In the new RhinoScriptCompiler (which is included in Rhino 7) the option to define the SDK has been removed:
You can only define the minimum Rhino version and then hope that it picks up the correct RhinoCommon.dll which obviously fails. As far as i remember it is supposed to pick up the oldest dll of the version you specify.
The old Compiler allowed to specify the dll manually in the SDK section under PlugIn settings:
I’ve asked @stevebaer about this when it was removed but cannot find the original thread. Maybe he or @will knows how to fix it.
EDIT: here is the original thread / question
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c.