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Do mods affect missions?
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I'm not sure if there are any trainers like that out there, but I hoped you backed up your files because you may need to restore some of the originals. I had to uninstall and reinstall several times because I didn't back up my files and had to restore the Banshee in order for it to load the mission.
Look up the mission you're getting stuck at and see if there's any special vehicles (in my case, it was a Banshee with special colors that was causing it to not load) if there are, restore those cars in particular and you should be good to go