Windows 10: Do I have to buy Windows 10 Pro AGAIN if computer dies 1 day later?

I purchased an ASUS with Windows 10 Home edition. My job requires that our desktops have Windows 10 Pro. My husband bought the 10 Pro download and installed it at our home. Wasn't hard and had no problems.. We took the new desktop to my office and it failed to boot up. I immediately returned it to Best Buy and they gave me another computer. I COMPLETELY forgot about the Windows 10 Pro upgrade we just bought. What do I do now? How do I go about getting my upgrade back? Again, the first new computer would not even boot up. Pleade help.

:)

 

Motherboard change unable to reactivate Windows 10 Pro -

I have searched this topic and everything seems to be almost a year old. This is a homebuilt machine circa 2015. It started with an ASUS FM2+ motherboard with an AMD A5600K processor. It was Windows 7 Pro, upgraded to Windows 8.1 Pro then to Windows 10 Pro.
Saturday the motherboard died. An exact replacement could not be located so a Gigabyte card was installed. No changes to the hard drives. Booted the machine and Windows automatically started and then did a "revert" then installed the latest updates. C Drive was in the red so I deleted all of the old install files using Windows Clean-up. Went to reactivate, checked the significant hardware change and entered my MS account information - The computer (none of my computers) were listed and now it is telling me that I have to spend $200 to buy a copy of Windows 10 Pro.
Have not yet called Customer Support as the computer is at home and I work during the day -
I do have a disk image or two that may be a year old -

Suggestions - should I just shell out the $200 and move on

TIA

 

Should I buy Windows 10 Home or Pro?

Can't believe no one posted this yet:
Compare Windows 10 editions: Compare Windows 10 Home vs Pro | Microsoft Windows

You can install Home or Pro then enter the key later once you make up your mind which to go with.

Performance isn't different between the editions, just features. If you connect to other computers using Remote Desktop, for example, you're going to want Pro.

 

Motherboard change unable to reactivate Windows 10 Pro -

Activate using windows 7 pro key.