Issue with Presenter add-in for PowerPoint

Good afternoon,

This is something that only just started happening to me.

We're using the Microsoft 365 suite of tools, but desktop versions, not web ones.

Whenever I start PowerPoint I get an error message. I click OK, and the application opens. (screenshot attached).

I've got a presentation that is saved locally on my laptop's c:\ drive, so not on my OneDrive. Then, when I try to use any of the tools from Articulate Presenter (e.g. content library), I get the same error. It looks like PowerPoint has stopped responding, but eventually the dialog box appears and I can proceed. I'm assuming the error message is related to the add-in as it happens then too.

I click OK, and PowerPoint stops responding. I have to use the task manager to quit PowerPoint.

The add-in is running. 

Any ideas please?

Thank you