I would then take the key from my laptop if possible
It seems yes! I did it recently, it worked fine.
So would it work if I took the key from my old laptop with win 7?
Normally yes. If there are problems, the support may also help
OK thanks for the help.
Very happy ^^
You mean on another device, not on the laptop?
Yes, activate Windows 10 on my new PC with the win 7 key from my old laptop
You install Windows 7 as normal,
put this tool on it
https://www.chip.de/...00470.html
And you can update it to 10.