If you want to downgraded from Windows 10 Pro to Windows 10 Home without losing personal files and apps, you can read this article.
Why downgrade from Pro to Home?
I had been on Windows 10 Home until my friend, who bought 5 copies of Pro keys, generously gave me one to upgrade Windows 10 Home to Pro. The upgrade process to Pro was easy and uneventful, until Windows wanted me to activate it afterwards. I used the Pro key but Windows refused to accept because of some reason like my original OS being an OEM or volume. It was during that time that reports came out about Microsoft causing all those activation errors. I even hoped that that was the cause of my problem, but it was not.
How to Downgrade Windows 10 Pro to Home
Step 1: You press Win + R to open Run
Then you type: C:\Windows\System32\spp\tokens\skus
Step 2: You download SKUs of Windows 10 Home here
Then you extract it and copy it to C:\Windows\System32\spp\tokens\skus (The local you open at step 1)
Step 3: You open cmd (run as administrator)
Then you copy and paste these codes:
cscript.exe %windir%\system32\slmgr.vbs /rilc cscript.exe %windir%\system32\slmgr.vbs /upk >nul 2>&1 cscript.exe %windir%\system32\slmgr.vbs /ckms >nul 2>&1 cscript.exe %windir%\system32\slmgr.vbs /cpky >nul 2>&1 cscript.exe %windir%\system32\slmgr.vbs /ipk TX9XD-98N7V-6WMQ6-BX7FG-H8Q99 sc config LicenseManager start= auto & net start LicenseManager sc config wuauserv start= auto & net start wuauserv clipup -v -o -altto c:\ echo
Step 4: You use Media Creation Tool to reinstall Windows 10 Home without losing data.
You can check again.
You can watch this video to know how to downgrade Windows 10 Pro to Home:
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