Not working on Python 3.7

I get '''File "C:\Python37\lib\site-packages\win11toast.py", line 284
elif isinstance(audio, str) and (path := Path(audio)).is_file():''' when trying to run the script on Python 3.7. Is upgrading python to 3.8 really the only way? Because I'm not doing it, there are way too many modules I'd have to install all over again.