I don't own the GOG version so I cannot confirm anything myself, but from various posts of GOG forum (see Sources below), it is possible that the Bloodsucker Pack and Unlockable Pack are/were bundled in the GOG release. These are disabled by default by "gog.ini", but can possibly be edited to re-enable them. Could someone test what happens when you edit gog.ini to enable these DLCs? If someone can confirm these DLCs are indeed included in GOG, I will edit the Availability and DLC list to mention that.
Sources:
- gog dot com/forum/saints_row_series/to_be_stickied_sr3_dlc_disabling_and_sr2_port_report_and_mod
- gog dot com/forum/saints_row_series/saints_row_3_dlc_blocker_gone