It isn't an official Microsoft ISO drop. This specific "Gen2" release represents a fascinating piece of the underground IT scene:
The term "Gen2" might refer to a specific iteration or tweaked version of the Windows Vista Ultimate x64 SP2, possibly modified or updated post-SP2 official release. When referring to an April 2017 update, it's essential to consider: It isn't an official Microsoft ISO drop
Windows Vista Ultimate x64 (64-bit) with Service Pack 2 (SP2). April 2017 Milestone: April 2017 Milestone: The "Gen2" label usually identifies
The "Gen2" label usually identifies releases by a well-known scene distributor who specialized in "clean" ISOs. These versions were popular because they integrated updates directly into the installation media (slipstreaming), saving users hours of downloading hundreds of individual updates through a notoriously slow Windows Update service. It isn't an official Microsoft ISO drop
Includes all mainstream and security updates published by Microsoft through the April 2017 EOL.