Plugin Install Cause Repeated Opening of Blank Rhino Files

Recently, I have been trying to run the installation of an RHI file to install a plugin. When the RHI filed is opened, Rhino 6 will open, but not run the plugin. Instead, it continually opens a lot of Rhino 6 blank files without ever installing the plugin. This has only started happening recently and reinstalling Rhino 6 has has not changed the error. Any recommendations?

Hello - have a look here:

Does the first item there sort it out?