There is no need to use all that extra garbage.
With just one dongle, one can use both DSDPlus and fmp24 and decode and also follow calls on a trunked system and conventional freqs.
Clicking fmp24.exe will try to open using the use first available dongle switch. (-i0)
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Launching fmp24-vc will try dongle number 2, which your system is saying is in use. Either driver issue or its in use in sdr#.
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Do not use fmp24.exe or fmp24-vc. Use Fmp24-CC.bat. Make sure the dongle is not running in sdr crap or fmp24 wont be able to open it.
Once you get fmp24 open and looking something like this, type in the freq you want to scan and verify you can see it on the spectrum.
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Then open 1r.bat