Backup your save files ( Documents/My Games/Titan Quest - Immortal Throne/SaveData/ ) before updating, just in case.
If you already own it on GOG, just fire up GOG Galaxy or download the fresh offline installers from your library. Titan Quest Anniversary Edition v2.10.16 -GOG-
Just a heads-up for fellow TQ fans – has been updated to version 2.10.16 on GOG. Backup your save files ( Documents/My Games/Titan Quest
Anyone else still grinding through Legendary mode? 😄 Titan Quest Anniversary Edition v2.10.16 -GOG-