Windows 10: how to reinstall windows 10 Pro using a previous software key

Greetings Microsoft Support,One of my PCs recently experienced an issue where the system became corrupted and so I have opted to reinstall on a new drive. I used the method of creating a productkey.vbs file in Notepad as described in your help article but upon trying to reinstall using this, the installer says that it "didn't work. Please check and try again."Is there something else I need to do in order to reinstall Windows 10 pro on my system?Thank you for your assistance.

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Thanks but I don't want to do any decrypting. I want to download a Win 10 ISO from Microsoft and install it using my Win 8 key. No other steps required. Is that possible?

 

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I read through most of that thread and it seems you have to jump through windows insider hoops. Is there a Retail Windows 10 x64 PRO ISO I can download directly from microsoft that my windows 8 key will work with?

 

How to reinstall Windows 10 if my computers used the free upgrade from 7 and 8?

Will windows 10 still accept the license keys from 7 and 8 now if I reinstall my computer?

Does Microsoft keep a list of users who upgraded to Win 10 using their 7 and 8 keys so that when users need to reinstall windows 10 the old keys would work?

Do I need to call in Microsoft to ask them to activate my Windows 10 when I give them my win 7 keys?

Both computers are laptops. The windows 7 machine had the serial printed on the back, and I needed to enter that when I upgraded to 10. The windows 8 machine had the serial built in inside its boot system so I didn't need to enter the key when I upgraded to 10, but I did manage to write down the keys using a fetcher program.