Go to official site. All three Exiles are freeware now, I think.
Part 1,
Exile 2 and
Exile 3.
Oh, and
Blades of Exile are free too, but it's more construction kit than game.
Unfortunately, they are Win16, so unplayable on any x64 windows without emulators.
(Also, googling screenshots are better with full name. I.e. "Exile: Escape from the pit", "Exile II: Crystal Souls", etc