Movingout-day-6b-mac.zip Info

Move the resulting folder to your Applications folder or a preferred directory. Run: Open the MovingOut.app file.

Based on that file name, this likely relates to the physics-based moving simulator game (developed by SMG Studio/DevM Games) for macOS, possibly a specific day-level mod or a repackaged version. MovingOut-Day-6b-mac.zip

What specific, unique content is in the "6b" version. Move the resulting folder to your Applications folder