My cousins laptop was running Windows 10, she sent it in for repair and they 'fixed it' by reverting it back to 8.1. I spoke to Microsoft support and they said I'm able to upgrade it back to 10 for free, however I'm unable to find the 8.1 product key (it's not on a sticker and she doesn't have the original box and contents). Will this be a problem if I upgraded it?
My Computer
System One
-
- OS
- 8.1
- Computer type
- Laptop