Back in January, the publishing rights for the classic Fallout games transferred from Interplay to Bethesda, and as a result the games had to be removed from digital stores, but now they have returned to Steam.
Fallout, Fallout 2, and Fallout Tactics are now all available to purchase on Steam for $9.99, or for $19.99 if you want all three. All three games support Steam Cloud for game saves, and both Fallout and Fallout 2 can be launched in either default of classic versions. The default version will allow for higher resolutions, while classic is completely unmodified.
It’s worth noting that while Fallout and Fallout 2 are compatible with Windows 8, Fallout Tactics is not.