Here is the page I found to get 2.5.5:
http://www.python.org/download/releases/2.5.5/
(I need it for Google App Engine.)
All I see is source files, not an installer. I’m not entirely sure how to build them on my windows machine. What do I do? (Open in Visual Studio, build there?) Or is there an installer I can use?
2.5.5 is unfortunately only available as source, but you can get 2.5.4 installers here. If you’re just debugging on your local machine for GAE, the differences between 2.5.4 and 2.5.5 won’t matter to you.
You can find build instructions for Windows here if you want to build from source. While they’re intended for developers building debug builds, they’ll work for you to make a release build as well.