The product documentation specific to Symantec ServiceDesk 7.5 SP1 and their download paths are as follows:
Document name
Download path
Symantec™ ServiceDesk 7.5 SP1 Implementation Guide
http://www.symantec.com/docs/DOC6823
Symantec™ ServiceDesk 7.5 SP1 User Guide
http://www.symantec.com/docs/DOC6824
Symantec™ ServiceDesk 7.5 SP1 Release Notes
http://www.symantec.com/docs/DOC6825