But now when I start it, it complains a lot.
like:
RDK plugin does not load.
RhinoCycles.rhp does not load.
3dxrhino.rhp does not load.
saying:
This plug-in is designed to run in the latest Rhino 6.0 Service Release
Rhino runs, but many things do not work
Checking for updates it announces that it is up-to-date.
Silence had reasons. Starting to uninstall Rhino 6.18 brought up a Rhino 6.17 uninstaller.
Running it resulted blue screen and dead computer.
Took up to now to repair installation (probably corrupted ntoskrnl.exe).