no reason to worry. The airspy HF+ is really a "plug and play" device.
Using it for longwave / medium wave dx depends on your antenna.
The coupling capacitor was changed from a few Picofarads to 4,7nF in the new models.
I tried it with a mag Loop and an end-fed longwire and for me a value between 100 - 200nF
showed the best results. The PCB layout and SMD size makes it easy to Experiment with different