If you download the game files (the .WAD file), it is highly recommended to use a modern "source port" rather than the original DOS version for a better experience on Windows 10/11 or Linux. Heretic: Shadow of the Serpent Riders - Delisted Games
While is not technically "freeware," there are several legal ways to download and play it, ranging from official remastered collections to archival versions and free browser-based options. 1. Official Modern Release (Recommended)
: You can find this collection on Steam , GOG , and the Microsoft Store.
: The Internet Archive hosts various versions of the game, including the original MS-DOS release and the reissue, which can be downloaded for preservation purposes.
: The first episode of Heretic was originally released as shareware, which remains free to distribute and download from many abandonware and historical software sites. 3. Improving the Experience with Source Ports
: If you already owned the original digital version, you likely received a free upgrade to this new collection in your library.
As of August 2025, the original standalone digital versions on Steam and GOG have been replaced by a combined collection.