Windows 8 Pro online upgrade offer queries

I have a laptop running Windows 7 Home Premium (OEM License) and an unused retail box of Windows 7 Home Premium.

1. If I use the Windows 8 Pro online upgrade on my laptop, Windows 7 Home Premium (OEM License), then the Windows 8 Pro license will be stuck to my laptop?

2. Will it be possible to purchase Windows 8 Pro online upgrade for my unused retail box of Windows 7 Home Premium without installing it , say into a virtual machine, first?