Please excuse my ignorance but is this a file that needs only to be installed in the INDI driver folder? Os is this a new build version of 3.1.1? I looked into trying to recompile in OSX but, I am afraid that is way above my pay grade at this point. I would need to upgrade my OS and then get Xcode, then learn how to use it , then...... I would probably just brick my computer somewhere along the way.
For QHYCFW3, there is no settings because it automatically detects the maximum number. IF it reports wrong number, please share the logs
For QHYCF2, there is a Filter (Count) setting in Main Control where you can set the number of filters before you connected. Make sure to go to Options --> Configuration Save to make sure it sticks.