i've found a similar question but i think is a bit incomplete. I know how to download and install El Capitan now that Sierra is out. You just have to change the date in terminal to something like 2015 and the download will start. This is exactly what i did a month ago. Now i'm having some random reboot caused by some sw (most likely Paragon and NTFS), but this is another story, so i would like to reinstall El Capitan. I've done as usuale, booting into recovery and trying to reinstall El Capitan. After i put my credential in it said that "This item is temporary unavailable".
I got this Mac a month ago, so, of course i didn't purchased El Capitan since Sierra was already out. Moreover, if i have to be honest, i've purchased that, with the same account on a hackintosh, but of course, this is not working as planned.
And again, since this MBP is a 2012 retina that came with Mountain Lion, i've installed El Capitan changing the date in terminal, downloading it from Apple directly and now i have that installed but it's, again, not marked as purchased in my account.
So, i don't want to upgrade to Sierra right now, i would like to purchase El Capitan in 2017 to be able to reinstall it. I know how i can see the link in the store, but when i click "get" it says "impossible to complete purchase".
Any hint?