New
#11
See if Settings > System > About > Change product key or upgrade your addition of Windows is the place.
It takes you to Settings > Update & Security > Activation > Change product key
TP Pro product key from: Download Windows 10 Insider Preview ISO - Microsoft Windows
6P99N-YF42M-TPGBG-9VMJP-YKHCF
Same key Aplha gave above.