Free Windows 8?

Limbothefirst

Honorable
Oct 22, 2013
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If I can find a serial key for windows 8/8.1 could I then download the digital ISO version of Microsoft, and use that key? can every key only be used ones?
Would I still have the same support/updates as someone that had payed for it? no 30 trial, etc?
If not can you think of any other way I could get it for free?