If you are a , use the file to audition the mixes, then buy the individual tracks you love from the official Ultimix website.
Properly labeled Artist, Title, and BPM info for Serato or rekordbox. Ultimix Back Spins Vol. 40.zip
A standard volume zip should be between 100MB and 150MB. Anything significantly smaller may be low-quality. If you are a , use the file