I've looked through all my files but the only ones I find are galimulator-jar and galimulator-jar.zip. Neither of those have been very helpful.

What OS do you have? Mac? If so you should be able to unpack the files in galimulator-jar.zip and then just double click on galimulator-jar.zip. You will need to have a java runtime environment, so something like: https://java.com/en/download/help/mac_install.xml