Hi
Within Install Manager, did you select:
(1) Path to SlatePack files
(2) Destination for SSD5Library folder (internal or external HD)
as shown here:
How To Install SSD5 Free on macOS
https://www.youtube.com/watch?v=rbr0fsC8xWk
(above video - @ approx 1:10) - in SSD5 Free
Settings: select
Base Directory (location of SSD5Library)
If the above 3 steps fail to fix your problem, contact Slate Support:
https://stevenslatedrums.com/contact-us/