This usually indicates a compatibility issue with your version of macOS or a lack of "Full Disk Access" permissions.

These releases often come with a custom installer UI.

Bennett Foddy occasionally updates the game for compatibility with newer macOS versions (like the transition to Apple Silicon/M1/M2 chips). The HI2U release is a "snapshot" in time and may not run on the latest versions of macOS Sonoma or Sequoia. Ethical Impact