Windows 10: Lost W10 Pro License

I need to reclaim my Windows 10 Professional License. I replaced the hard dirve in my PC and installed the OS to a new Solid State drive, but it loaded as Windows 10 Home. When I originally purchase the Windows 10 Professional for this machine it was an online download and I have no key to reload it. How do I get my Professional License back?

:)

 

moving W10 Pro license to another computer running W10 Home

I am a long time W10 Insider.

I had a Gateway NV79 running W10 Pro and it bellied up with on board battery issues and is non functional.

I want to move that Pro License to another W10 machine running home.

What are the steps/

Thanks,

Norm Weed

 

why there is just one way to upgrade from W10 Home to W10 Pro?

You can purchase a full license key, but keep in mind, the full retail license for Windows 10 Pro is more expensive than the $99 upgrade through the Store.

Step 1: Purchase license for Windows 10 Pro, then receive your key:

Buy Windows 10 Home/Pro

Step 2: Perform an Easy Upgrade using the key:

• How
  to Perform an Easy Upgrade in Windows 10

 

W10 Pro generic license - trial period and legality

I have a client who is performing clean PC rebuilds from W7Pro to W10Pro and stated he used the following link to perform the task (view the link at the end) and was successful. I remoted in and saw that he has a generic code that generated VK7JG-NPHTM-C97JM-9MPGT-3V66T.
This PC did NOT include a W10 Pro license nor was this done during the "free" upgrade period of July 2015-2016. My understanding is that a genuine W10 Pro license (or an upgrade license since the PC did come with W7Pro) still needs to be purchased in order
to adhere to the EULA. Besides the legality issue are there any repercussions to this build i.e. is it a temporary license and for how long i.e. how long does he have with this generic code? Are there any lost functionality and if so what?

Please provide link or documentation as I feel this client thinks I am misinformed about the license rules. He is under the understanding that ANY pc build in 2012 or later is eligible for a free W10Pro license.

https://www.microsoft.com/en-us/software-download/windows10