can i use the windows 7 on my hdd to license my windows 10 on my SSD

I just built a new PC installed windows 10 and everything.
i found an old laptop of mine that isn’t working anymore and like any bored person i dismantled it and found it smart to use the 500GB hdd as extra storage. I discovered that windows 7 is installed and since microsoft upgrades windows 7 to 10 for free i was wondering if anyone knows a way to license my windows 10 using the old version in my hdd?