To Get Retro City Rampage for MS-DOS on Steam: 1. Update the game (if you don't see an update, restart Steam) 2. In Steam, go to Retro City Rampage DX's "Properties" 3. Click "Local Files" -> "Browse Local Files" 4. Open RetroCityRampage486_MS-DOS_v1.0.zip
For Humble Store or GOG, login and download the appropriate .zip file.
If you don't have an old PC running DOS, RCR:486 works great under DOSBox.
You can also run DOS and RCR:486 on modern PCs by creating a DOS bootable USB flash drive, CD or DVD.
Over two years after the initial release, the post launch support continues!
Retro City Rampage's 'DX' version which debuted on Nintendo 3DS earlier this year is coming to PC as a free update, along with more HD bells and whistles. New zoom modes, video options, new 'DX' Leaderboards, and much much more!
Additionally, it's coming to Mac OS X!
Both the major update and Mac version will be free to everyone who owns the game already or purchases it in the future. Specifically, like all Steam games, the Mac version will be available for free to all who purchase or have purchased the PC version, and the PC version for all who purchase the Mac version.