Where can I get Windows 8.1 product keys?

[akuboii]

I created a bootable USB drive that I can use to get Windows on my PC, but where can I get a product key? I went to Microsoft's website and there was only Windows 10.

 

[Major_Trouble]

You find it in the retail packaging of the Windows 8 DVD.

 

[akuboii]

So it's fine that I don't use the DVD for the installation. That the key should work even though I boot it on a USB?

 

[sna]

So it's fine that I don't use the DVD for the installation. That the key should work even though I boot it on a USB?

yes