Hmmm. Did you run into any trouble like this when you obtained (assuming you did) any of the other versions of the DE? As long as you have all the files in one folder, and go to extract the first file of the set, it should work. Could you post some more info on exactly what steps you are taking as well as the exact text of the error message you’re getting?
Also, to other members, I know next to nothing about using Mac books. Are there any users here proficient with Mac OS who might know of troubleshooting steps that I might be overlooking? LordZerome1080 could use your help.
The exact specifics are that jdownloader refuses to complete the downloads and the unarchiver says the files are either incomplete and cannot be extracted.