Microsoft Office Add In Error

Same here I cannot install the wisesheets plugin or now any other plugin. I've tried deleting the wef folder but its not helped. I'm now getting "You don't have permission to use this add-in Contact your system administrator to request access" which is slightly more than i got last night.

I had a remote connection from Microsoft help but it was useless. I do better support for my mum. Initially wanted to fob me off and saying its an external add-in go see wisesheets. They have records of the timestamped errors but seem to be having trouble with their OMEX servers.