After the FLEX6600M is upgraded to 3.3.32, the CAT port is gone?

If you are, as you should be, conducting periodic back-ups of your computer see if C:\Users\computer-name\AppData\Roaming\FlexRadio Systems is included. From there take the CAT.settings file and copy it to the working directory to restore CAT as it was before the upgrade.

Alternatively, use a Restore Point and roll back to before the upgrade, save the Flex settings, reinstall 3.3.32 and copy back the saved settings.

Alternatively, and most simply, recreate the missing port for N1MM - it will take just a few seconds to do.