It couldn’t possibly more clear. Vista is not supported.
You need Windows 7 SP1 or Windows 8.
Well if it states, when you try to download InDesign, that your computer system no longer supports the program, you'll need to upgrade your computer if you want to use the latest version of InDesign.
Software drives hardware.
Maybe what I need to know is why. When I have paid a lot of money for a lot of other programs, why would this particular program be different. Guess I don't need it that bad. I will just use photoshop and Powerpoint to get what I need. I already have those.
Why? Let me put it to you this way…you’re the first person I can think of that has asked about Vista support in years.
I assume the apps you have are rather old because no new versions of CC software will run on Vista.