It's a non-admin account, so the installer is installing the app to /Users/username/Applications/Roblox.app instead of /Applications/. Roblox won't launch so it's hard to confirm the version number, but Get Info says it's 1.70. But even deleting the user account and recreating it did not suffice to cause the game to launch properly. Other user accounts on the same machine will launch the game just fine. Launching from Firefox instead of Safari did not help. Launching from the webpage in Safari also populates the console log with a bunch of entries that I believe are correlated with the launch attempt, but instead with process name or. Timestamp Roblox ERROR: Embedded application launched without command line options Timestamp Roblox Command Line: No command line arguments Launching the game manually in this manner does all you to see in Console.app a long list of launching messages, ending in this error: timestamp Roblox Command Line: Handling command line options Note that launching the game from the Dock or from Finder, as suggested under "Other Things to Try" in the Mac:Troubleshooting page linked above, still did not cause the game to launch. I have done this, deleting Roblox.app and RobloxStudio.app from ~/Applications, and also and from ~/Library/Preferences/. They suggest uninstalling and reinstalling the app.
Google turns up some info, like Mac: Troubleshooting at and Can’t launch Roblox on Mac at.
I can't get Roblox to launch under one user account on a mac.