Due to increased restrictions on the Mac operating system, in order to run TS!UNDERSWAP on a Mac device, a short process must be done beforehand.
First, make sure you extract the game ZIP file into its own folder. Inside, it should look something similar to this:
Next, open a Terminal window. You can open one by using Spotlight search.
Keeping the Terminal window open, click and drag the "MacFix" folder onto the icon of the Terminal on your taskbar (likely at the bottom of the screen).
If done successfully, a new Terminal window should appear over the previous one, and will say "MacFix" on it somewhere.
Type these exact commands into the Terminal window, in this order:
chmod u+x TSUSMacFix.commandxattr -d com.apple.quarantine TSUSMacFix.command
Make sure to hit ENTER/RETURN after typing each command, so that they are executed.Now, navigate in Finder to the MacFix folder that was dragged earlier. Double-click the TSUSMacFix.command file to execute it. This should launch a new Terminal window once more.
If it fails with a message saying that it cannot be run due to being from an unknown developer, then the previous steps have failed. Be sure to follow them carefully, as the order is crucial (you may have to extract the ZIP again to reset it). Mac version changes may also affect this, however.You should see a message that looks like this:
Now, navigate to the TS!UNDERSWAP Demo.app file in Finder, and drag it onto the message on its window.Finally, hit Enter/Return, and some console messages should appear. By the time it's finished it should say "Process completed" or similar.
If all was successful, the TS!UNDERSWAP Demo.app file should now be able to run!
If there are still issues, feel free to contact us in the #troubleshooting channel of our Discord.