Bash Script (Terminal) to guide you through fully restarting OneShot on macOS.

TwoShots.sh

# Script by Yhvr. Liscensed under the WTFPL.
# I take no responsibility if this fucks anything up.
echo Please open your Steam library, then press ENTER to continue. You\'ll press it in the future whenever you want to know what to do next.
read a
echo Right Click on OneShot, then select properties from the dropdown.
read a
echo Select the \"Updates\" tab in the window it opens up, and un-tick \"Enable Steam Cloud synchronization for OneShot\".
read a
echo When you have Steam focused, select \"Account\" from the top bar, and then \"Go Offline\".
read a
echo Deleting save data...
rm -rf ~/Library/Application\ Support/Oneshot
echo There\'s no to do this without it being hard, please navigate to \"\~\/Library\/Application\ Support\/Steam\/userdata\/\<unknown folder name\>\" And delete the folder called \"420530\".
read a
echo Launch OneShot, and get past the first cutscene.
read a
echo Close OneShot.
read a
echo Fully relaunch Steam and then select \"Go Online\" in the prompt to enable online mode.
read a
echo Right Click on OneShot, then select properties from the dropdown.
read a
echo Select the \"Updates\" tab in the window it opens up, and tick \"Enable Steam Cloud synchronization for OneShot\".
read a
echo Launch OneShot.
read a
echo You should see a \"Synchronization Error\"- select \"Upload to the Steam Cloud\".
read a
echo Enjoy!