Windows 10 Enterprise will expire soon

My PC came with Windows 10 Enterprise edition preinstalled and now I get a message that 'Windows license will expire soon'.

I have tried rearming (slmgr .vbs /rearm) and restarting and changing group policy but still no results and I cannot contact the store that I bought the PC from.

• I am reading that it is possible to downgrade to Windows 10 Pro by getting a license key for Pro and changing keys
• I have also read that if I let the license expire it will automatically downgrade to Pro

I have no idea if the above things I have mentioned can be done.

What are my options here and what can I do?

NOTE: I really want to avoid formatting and clean install since it took me ages to set up this PC (it is used for music production)

Theoretically [though I have never attempted this] you can downgrade Windows 10 Enterprise to Pro by changing the Product Key.

From Apes With Computers - Downgrade Windows 10 Enterprise to Professional

1. Open the Settings app and click Update & Security.
2. Open Activation and click Change product key.
3. Enter your Windows 10 Professional product key and click Next.
4. Restart the computer after the new product key is activated.

You can force a downgrade with the default product key (VK7JG-NPHTM-C97JM-9MPGT-3V66T) of Windows 10 Professional, however this will not activate Windows.

Note this can only be done with Enterprise to Pro, you cannot downgrade Enterprise to Home.