What version of DSDPlus do you have? You don't need the gui or any plugin at all if your looking to monitor a conventional dmr freq.
Depending on which DSDPlus, Free version FMP + DSDPLus. Fastlane version FMP24 + DSDPLus.
If FastLane, you don't need vb cable.
And what version of sdr? If 1800 thru 1831, or 1832, then the plugin in can be found here since the airspy site turned to ****. I am not sure if the newer versions use the magic line any more. The whole thing went down hill with the floating dock garbage.
This is the official home for DSDPlusUI, DSDPlusUI is a feature packed Graphical User Interface that is designed exclusively for use with DSD+ and the bundled tools.
dsdplusui.com
Enclosed is the simple dmr plugin for SDR#. Not sure what versions it works with but it works in 1742. The 2 dll files go in the Sdr# directory and the text in magic line gets pasted into the plugins.xml file in the Sdr# directory.