The one thing that I would add to Dean's advice is to include snap-on ferrites for the lines in and out of the computer (audio and USB). I found I had RF feedback issues that distorted the audio in both directions, and some intermittent cat issues. The ferrites seemed to solve that.
Also, I did need to purchase an inexpensive USB audio dongle for it to work with my laptop. For that dongle, I connected the mono audio into both of the stereo input lines for the best results. BTW, I have 3 and all seem to work with the WSJT-X software, so do not have a specific version to suggest. I am currently using a Plugable adapter that is no longer available on Amazon where I bought it.
If you still have problems, then an EasyDigi interface for the transformers will help in grounding issues.
Above are my experiences with both a v4 and v5 rig working FT8.