First of all, there is no good substitute for decding from the IQ stream. You will have far more success with the SDC Skimmer decoder windows or The Afreet CW Skimmer.
CW Get is very old and not designed to work with SDR radios. That said, there are set up instructions contained within the program that will help you if you feel you want to persevere. One of those clearly staes the need to connect to a soundcard. If you have followed the UMA properly, you will note that this means attaching CW Get to VAC Line 8 and not Line 1.
This produces the best result you likely to get with this program:
As you can see it decodes but does not correctly read all of the time. SDC Skimmer is nearly 100% accurate even with the weakest of signals when set up correctly: