Version 2.71 specifically requires libfftw3f-3.dll to process spectrum data. You must download this separately (links are usually found in the Notes.txt included with your download) and place it in the main folder. 2. Resolving "File Not Found" (DSDPlus.radios/groups)
Use a program like WinRAR to unzip the 2.71 update package. dsdplus 271 download fix