Swim was updated a few weeks ago and should work fine with both S22 and R23. I just tested it myself with the attached ase file. Please make sure you have the most recent version.
If the attached ase file works but yours does not, please share your ase file so I can find the compatibility issue.
If the attached ase file doesn’t work for you with the most recent SwIm installed, please check the console (Shift-F10), Python Tab for errors and post them here or in a direct message to me.