OK, let's see if the contents of your historical start files look as they should. You can find them by opening the game, then going to Settings, then Troubleshooting, and clicking on "Open customizable data folder." That'll open Finder in your main game folder. Then go into quickstart_games and then historical.quick and take a screenshot of the contents of that folder, with the file sizes visible, and post it here (don't worry about the graphics folder, I just want to compare the .dat files and their sizes to the ones in a working installation.)
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