You can get any build from any version (including enterprise). 

I did not say they were from the 'MS store'.

What I'm saying is that ISOs to every windows are legitimately hosted legally, they've just tried burying them a bit so try and convince people to use their tool but it still remains that images to every version of windows can easily be found with just 5 minutes of google, and hosted on verifiable reliable sources .. not some guy on bitcointalk forums.  Heidoc is just an app that makes it a bit easier to crawl through their hosting domain for the location of the isos (which are there and legally and freely downloadable).

At least sell them with the activation key.

I'm not going to argue with some stranger here on bitcointalk, just to anyone looking for windows images I suggest you at least do your research, take a look at the vendors who are selling keys (for enterprise too) as they'll probably be able to link you to the same windows ISO locations to which I'm referring and just use common sense in not buying an operating system's ISO from a stranger on the internet. 

I have no dog in this fight against you and your potential customers, I just don't like the idea of people being ripped off for their bitcoin (or worse) cuz I like this forum, it's a good source of some valuable commodities and it truly is sort of ridiculous to be asking for money for JUST a windows ISO (without a key).