Adobe Update: APSB15-15 fails to download in the Patch Management Solution (PM) - Patch Remediation Center
Found different errors as downloaded between PM 7.1 SP2 MP1 and PM 7.6, and currently reviewing PM 7.5.x environments.
7.1 SP2 MP1:
Package management within 7.6 HF.x failed to download the updates.
Package management within ITMS 7.5 HF5 appears in order and the cause is FTP download URL is not enabled for the environment as outlined in INFO2742.
Package management within ITMS 7.1 SP2 MP1 appears in order; found the Software Updates do hang for some time and will download eventually.
This issue was resolved in ITMS 7.6 HF5.