I'm wondering if I can use FileMaker Go 13 or 14 on my iOS devices with a Mac desktop version FileMaker Pro 11 Advanced? Or, does anyone know if theres a version of FileMaker Go 11 and where it can be downloaded from?
There was a version of FileMaker Go 11, but unless you previously purchased it from the App Store, it is no longer available for download. Only FileMaker Go 14 (and FileMaker Go 13) are available to download for new customers.
As for the compatibility part of your question, FileMaker Pro / Go 11 used the .fp7 file format while FileMaker Pro / Go 12, 13, and 14 used the newer .fmp12 file format. So there would be a compatibility issue trying to use both file formats with the versions you mentioned.
Thank you. I figured this might be the case.