My laptop has Onenote installed as a local product and in File\Account it shows up as activated with one product installed.

My Surface has an old corporate "Microsoft 365 Apps for enterprise"...

OK. That might be the best in the long run anyway. I shall investigate a decent sized SSD.

I am trying to run updates on my son's desktop PC. It's been idle for 12 months so it's got a lot of updates to run through.

The PC has two drives. The C: drive is an SSD with 64GB capacity and...

My Win10 enterprise edition deactivated a few days ago and wasn't able to be reactivated.

I downgraded to Win10 Pro with the generic key from step 1 and it activated automatically using the...

That worked beautifully - thank you.
I used the generic Win10 Pro product key from the tutorial you linked and it activated straight away. Who would have thought it would be that easy.

My Surface is an ex employer machine. Purchased new it was delivered with 8.1 Pro and I have the key for this. My office installed Win10 Enterprise and I have been using that licence both at work...