Hey I have purchased Win7 quite a while ago and upgraded to Win10 a few months ago. Now that I am getting my new iMac tomorrow, I worry that I can't install Windows anymore. I only have the Windows 7 DVD + key which should be deactivated, right? Can I install Win7 via Bootcamp and then upgrade again to Windows 10? I realise there could be activation problems with the hardware change, but if that is the case, I would buy another license. First, I want to install it. What's the procedure here? Just go with the Win7 DVD? thanks!