Can iMac 27" Late 2009 High Sierra run Windows 10? Bootcamp only takes it to Windows 8.1

[Jamval]

I have an iMac 27" Late 2009 running High Sierra updated to latest version 10.13.6. Bootcamp 6.1 would only let me install Windows 8.1 64Bit. No driver issues so far, display, audio, network, mouse/keyboard are working.

Bootcamp shows a 'compatibility' message on each boot saying something about it being for Windows 7. But everything is working satisfactorily.

Can I upgrade to Windows 10 from within Windows 8.1 since Bootcamp won't?

Thanks for any advice.