I was questioning whether to purchase a Windows Key from a 3rd party at such an inexpensive price but...

I emailed Gamer's Outlet about the process for using the "Windows 10 Professional Retail Cd Key Microsoft Global" to upgrade from a Windows 10 Home edition to the Pro edition and they sent me back the instructions for a 2-step process with an intermediate Version Upgrade Key which would need to be installed before the Pro Key could be used to activate.

After installing the Version Upgrade Key and a reboot, the Laptop showed Windows 10 Pro was the current edition but needed to be activated. I purchased the above Retail CD Key and and to my surprise as soon as the Retail Key was installed it showed a fully activated Windows 10 Pro edition. Even though it wasn't necessary I rebooted to make sure the activation stuck and it came back up with Windows 10 Pro fully activated with no windows error messages.

This site is now bookmarked for any future needs.

Sketchy as hell but worked for me I guess, will make an update in case further issues. Nothing to say bad right now so i put 5 stars

Dopo alcuni problemi iniziali tutto si è risolto al meglio.
Prodotto funzionante !

works like a charm on a clean install windows 10 pro ;-)

Had issues with the initial key provided, but support was instant, and they replied with a replacement!