Ok.
You need to extract all the files from the zip file and put them in the dictdata folder.
The bit that may be tripping you up is that within the zipfile there is also a .dz file which contains the .dict file that also needs to be extracted. 7zip can do this. Not many other extractors in my experience can.
Your dictdata folder should contain the .idx, .ifo and .dict files from the stardict zip file.
Hope this sorts it for you.
Edit: You might find this thread of interest.
https://www.mobileread.com/forums/sh...d.php?t=348719