Trying to convert all of the music for a prolific musician is a true test of patience and endurance, since there is no way of knowing whether the program will quit after 5 songs or after 60. To restart the conversion session, the original Spotify playlist used for that session must be edited to remove the songs already converted.
Their current Spotify Converter running on my MacBook Pro will typically convert from 20 to 30 songs (but ranging between 5 and 60) before it quits.
They completely stopped supporting the previous Spotify Converter program which I had paid for, but which was loaded with bugs, so I had to purchase their new and completely different Spotify Converter to try to move forward with conversions. From that date on until today (7-14-22) I've not received a useful response to any one of my 30+ emails.
The response to my next request for help was received on 4-3-21 and stated "Your request (13512) has been received and is being reviewed by our support staff." This email appeared to be a template, without the name of the person sending the email. The last email I received from Inez Miller was on 2-28-21, and she answered my question, as always. Inez Miller left the company, and the previous TuneFab company appears to have become part of a German/Hong Kong company. On November 4,2020, I submitted a review of TuneFab entitled "Most responsive company in my memory!" TuneFab appears now to be a completely new company.