Extension Manager window is blank & Preferences doesn't display and extension box

@colin
When this started happening I searched the forums and found others having the same issue so I followed suggestions from other SU Team members which included deleting the WebCache. Unfortunately It didn’t solve the problem.

GOOD NEWS is that after forcing a driver update though my computer’s manufacturer’s Asst. App (Windows update told me everything was up to date) I can now see the extensions in my extension manager.

BAD NEWS - I’m now getting a ‘error loading’ message at startup for all the extensions I downloaded and installed. I click OK and the extensions appear on my desktop. Screencap attached.

I’m an occasional user of SketchUp (using AutoCad mostly) so I’m not totally up to date on any changes to how extensions / plugin’s are installed.
In older versions didn’t they have to be installed through the Preferences dialog box? I’m not seeing that option anymore in that dialog box.