•Arena and Daggerfall include a pre-configured version of DosBox that gets installed during installation and allows you to play on modern machines.
•Morrowind GOTY and Oblivion GOTY are based on the retail versions of the game, which do not require Steam activation. For Oblivion, this means that the disc version of the game does not include the smaller add-ons (Horse Armor, Fighter’s Stronghold, Mehrunes’ Razor, etc)… more on that below.
•For Skyrim, the disc is based on the Legendary release of the game, which requires Steam activation.
As a bonus, the included Steam key will activate Steam versions of Morrowind GOTY and Oblivion GOTY Deluxe. Like the disc release of Oblivion, the deluxe versions include the main game, Knights of the Nine, and Shivering Isles, but it also adds English versions of the Wizard’s Tower, Fighter’s Stronghold, Orrery, Thives’ Den, The Vile Lair, Mehrunes’ Razor, and Horse Armor. These add-ons are not compatible with the disc version of the game, so you will need to use the Steam version to access them.