Files for Mac can be run on all versions of OS X. You need to uncompress the 7z archive using the proper software (please use Keka to avoid problems). If the archive contains a DMG, double click it to mount the disk. After that, drag & drop the game icon into Applications (or another folder, Desktop will be fine too). New versions of MacOS block applications from identified developers. If you have this problem, just press Ctrl while clicking the game icon, and select Open. Alternatively you can use the “Open Anyway” button in the General pane of Security & Privacy preferences. See the FAQ page for more info.
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On WHDLoad games, all saved games are temporary until you exit to AmigaDOS. So don't save and simply exit the emulator, otherwise the saved game will be lost. Pay attention when you launch the game: a small window will tell you which key can be used to exit the game. Often it's F10. On Mac, the key could be different from what is written, try different ones (for example Page Up or Page Down). The right process is: save the game, then exit the game with F10. Finally, when you are back to AmigaOS, you can close FS-UAE.
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