Switch from KMS to OEM

 To convert, do the following: 

• Press Windows Key + R 
• Type cmd in the run command line and press CTRL + SHIFT + ENTER to gain administrative access 
• Type: slmgr.vbs -ipk <enter your 25 digit Windows 10 RETAIL product key here> and press enter 
example: slmgr.vbs -ipk 12345ABCDE12345ABCD12345 
• Then type: slmgr.vbs -ato 

If you have no 25-digit Windows 10 Retail Key and the PC was purchased with pre-installed OEM license, you need to use the following Generic Key: 

YTMG3-N6DKC-DKB77-7M9GH-8HVX7 – If your had had Home version even if you upgraded to Pro through Windows Store 

VK7JG-NPHTM-C97JM-9MPGT-3V66T – If you had Pro. PC was purchased as Pro not upgraded from Home 

BT79Q-G7N6G-PGBYW-4YWX6-6F4BT – If you had a Single Language edition 

These Generic keys will just convert KMS to OEM but will not activate Windows. To activate, you need to go through the digital activation after the conversion by signing in with the Microsoft Account where your Digital Key is associated. To do that, go to Settings > Update & Security > Activation > Add an account 

* Note: If the activation says "Windows is activated with a digital license lined to your Microsoft Account", no need to do anything.