Plug in your Midi Fighter Twister via USB (not to a USB hub) and follow the onscreen instructions on the utility. Once the firmware is up to date you need to download one of the mappings available ...
HetrickCV is compatible with VCV Rack 2.0.0 and later. Releases can be found on the Release Page, including auto-generated "Nightly" releases from the latest commit. There is a "v1" branch for code ...