So, usually it ends up making a folder called "GIFsquid_Output" in the same folder that your last render went to. If you can't find it, try adding your comp to your render queue manually and check the output folder (no need to actually render, just check the path) and then check for the Output folder there. Another option is to search the drive for "*.gif" and sort by date modified. Usually the folder is opened for you after the gif is done rendering, but sometimes it fails to open the right folder. I've seen this happen when the project is saved in the root of a folder (like T:\project.aep)