The software was updated and fixed on April 29,2023.
HyperSwitch is a free Window Switcher App on macOS. I used it a few years ago and haven't found a perfect replacement yet. But the author stopped updating the software a few years ago.
Currently the app always pops up with the error "HyperSwitch Expired!" Dialog box, and cannot turn off the auto-check for updates option, you can change the popover by replacing the executable file masking in this repo.
sudo mv HyperSwitch /Applications/HyperSwitch.app/Contents/MacOS/
sudo chmod 755 /Applications/HyperSwitch.app/Contents/MacOS/HyperSwitch
Or download repackaged dmg and reinstall the app
You can also try alt-tab-macos, as suggested by @ryankhart