Pack installation fails

Hi,

I try to install a pack.
I'm on windows with a pro license.

I did:
- Project => Manage => Pack installer
- I gave the path to the file.pack
- I had an error in the output console :
Refresh Pack Descriptions
Cannot install Pack blablabla: Cannot create restore point - Please check Pack folder for opened files
Refresh Pack Descriptions

I've no idea of what it means ...
thank you in advance for any help
Chris

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