Because the official thread is getting kinda clogged. It worked back then, we can spread it out a little more in here.
Plus, us (3?) need a separate place for GIMP what-have-you's
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I can't believe I found that place. It's for 1.4, but it still applies to newer version 95%. It's too important to be left lying around in the sticky.
After some questions on where it is actually found, you can find the installer for windows here. You will need the first 2 things, and GAP if you want to animate.
Here's a portable app if you want to run it off a flash usb drive, or live CD