First, this is a Windows only game. It also is not for your grandfather’s video card. You can check out the TouchDesigner system requirements to see if your computer will work. If you own a Mac, you can install Windows on it pretty easily via Bootcamp other Windows emulators will not work.
Once you have Windows and at least 512MB of graphics ram, you can download TouchDesigner to run Rouge and build your own filters and compositions. TouchDesigner is free, up to 1280×1280 resolution.
Download Rouge088 v1.1.0 and be sure to extract the files or the paths to supporting files will break. You can right click on the .zip folder and select extract. Open Rouge with your chosen software, and get started.