Update Musescore Drumline Extension...

Just updated to Musescore 3.3.0.24090. Got a message saying to open Resource Manager to update one or more extensions, all were updated except Musescore Drumline, when I try to update this extension I get an error message telling me that my hard drive is "Read Only" and that the update failed. I have checked my drive info etc... all good as far as I can tell. Any suggestions?
Thanks