I have a laptop that originally had windows 8 on it. In its long life the drive got formatted many times, many different OSs were installed on it and now I even have a completely different drive. What I mean to say is that there are not recovery partitions or anything like that.
What I want to do is put windows 10 on this laptop, which currently only has linux installed on it. I have a retail copy of win 10, but I don't want to use it since I have an OEM key for win 8 on this laptop and I feel like it would be a waste not to use it, since until July I can still upgrade to 10 for free. So what I'm asking is, can I just straight install win 10 onto the laptop (after wiping the drive naturally), or do I need to first install 8 that will read the OEM key, and then upgrade to 10?
Also, if win 10 cannot accept a win 8 OEM key, does this mean that if in the future (after win 10 upgrade is no longer free) I decide to wipe my drive for whatever reason, and then later decide I want win 10 back on it, I won't be able to get it since my key will only be valid for win 8 and upgrade is no longer free?