Here you can download the official Windows Vista ISOs for free.
Windows Vista is a major release of Microsoft’s Windows NT operating system. It was released to manufacturing on November 8, 2006, and became generally available on January 30, 2007, on the Windows Marketplace, the first release of Windows to be made available through a digital distribution platform. Vista succeeded Windows XP (2001); at the time, the five-year gap between the two was the longest time span between successive Windows releases.
Download Windows Vista x86 ISO:
Architecture: x86 (32-bit)
File Format: ISO
Download: Archive.org
Download Windows Vista x64 ISO:
Architecture: x64 (64-bit)
File Format: ISO
Download: Archive.org
