Is your Windows license expiring soon?

I switched to Windows 10 about 6 months ago. On my laptop I always get the message when I start up, your Windows license will soon expire. "I've tried several things on the Internet. Since I can't remove the text field, I have to be more forced to buy a new key. Currently the Windows 10 Pro Key is activated. Can I simply buy a Windows 10 Home Key for 30 euro and then simply change it?

Yes, you can do that.

Windows will adapt according to the license key and deactivate the functions that are not available in the Home Edition.