While most may already know this, just thought I'd throw out some quick info for those that might not be familiar with the first series of games.
The games that were offered by Epic in this special were the original releases of Fallout 1, 2 and the follow-up RTS game Fallout Tactics by the original game house Black Isle Gaming.
While similar to the games produced by Bethesda (Fallout 3, 4 and the online game FO 76) and Obsidian (Fallout New Vegas), they were released much earlier so the graphics will be lesser and the game play more akin to a traditional RPG for FO 1 and 2.
Fallout Tactics will differ significantly in gameplay because it's an RTS rather than an RPG like the first two and much different from the later FPS/RPG hybrids from Bethesda and Obsidian.
TM