I tried to download a trial version of Photoshop CS6, but was unable to do so since I am running Windows Vista which is apparently "unsupported". Is it possible for me to download a trial copy of CS5 extended?
Yes, you can download a trial copy of CS5.5 Extended from http://prodesigntools.com/adobe-cs5-5-direct-download-links.html
You'll only be able to use it for 30 days though. Adobe no longer sells it so you will not be able to buy a serial number for it.
Can I download CS6 on a Windows 7 machine, then install it on my Vista machine?
That won't achieve anything. CS6 will not run on Vista. Doesn't matter if you download it on any machine or obtain it on Flash drive or DVD - it still won't run on Vista.
System requirements are here:
Are you in a position to upgrade Vista to Win 7 or Win 8 and avoid all this running around?
I wasn't able to access any of the CS5 links. Do you know of any other legitimate sites I could try?
What happened when you tried? Anyone asking for links to earlier versions always gets referred to prodesigntools.com. There are countless threads in these forums pointing to that site. The download links have always worked in my experience.
You must follow the Very Important Instructions found on all prodesigntools.com download pages first for the download links to work.
I don't care for W7 or 8 and surprisingly, I've never had a problem with Vista.
You'll find that you won't be able to run current or future versions of Adobe software on Vista.
Most Adobe software nows runs on only Windows 7 or Windows 8.