I bought a license key for Windows Enterprise on eBay. The seller sent me a .iso file (Windows Enterprise cannot be downloaded from the Microsoft website directly). He told me he sent a version of Windows Pro upgradable to Enterprise, so the license I bought may be used to upgrade this version of Windows Pro to enterprise once Windows pro is installed.
This sounds a bit odd to me, I wonder if I should worry about the .iso file he sent and which are the risks involved in installing a non-original operative system (i.e.: might someone take control of my pc?) I guess it is an older version of Windows he downloaded from the Microsoft site himself (which is no longer available due to commercial reasons) but what if it's an hacked version?
Is there any trick to see if the build of Windows I installed from someone's .iso file is original?