Since your file is a .rar archive, follow these steps to set up the game:
You can choose from three main classes, each with distinct playstyles: Primary Stat Combat Style Melee-focused warrior with ancestral spirit magic. Vanquisher Ranged specialist using bows, guns, and traps. Alchemist Torchlight.v1.15.GOG.rar
A Pretty Basic Guide in Playing Torchlight - Steam Community Since your file is a
: Locate the extracted folder and run the GOG offline installer (usually an .exe file). Configuration : Torchlight.v1.15.GOG.rar