You can select a framerate in the options. Please note that not all framerates are valid and will get rounded to whatever the GIF format actually supports. Also note that if you enable Turbo mode, it pulls the framerate from your comp.
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It really sounds like you're missing some files and/or AE isn't set to allow scripts to write files/access network. Please try re-extracting the JSXBIN file and the GIFsquid folder into your AE/ScriptUI folder and double-check the preference to allow scripts to write files. In your case, the script is choking at the point it should be able to write to C:\programdata
All I need to do is buy a Mac. At this point, it would take 200% of what I've earned from GIFsquid to get the cheapest mac that could run After Effects. I am always keeping my eyes peeled for used hardware.
Ok. Please try this for me. Open a new File Explorer window and go to c:\ProgramData (if the folder is hidden, just type it into the address bar)
Inside you should see two files: GIFsquid.log and squidyavi.bat. Open both of those in notepad and paste the contents here or to pastebin.
I've seen this happen when your harddrive is near full. It can also happen if your project is in the root of a drive and not in a folder. Another thing to check is that you have the AE option "Allow scripts to write files and access the network" set.