More versions of GBBS Pro System software will be available in the future, however at this point, only GBBS Pro Version 1.2 for DOS 3.3, Gbbs Pro 1.3 and GBBS Pro 1.3j are available on this website at this time.
The system has been announced as a GPL product, however the copyright remains with the owner of GBBS Pro and LLUCE, Kevin Smallwood.
You can download the desired disks below:
GBBS Pro 1.3j ProDOS
Disk 1 Disk 2