+ CLASSIC DOOM / DOOM II UPGRADE PATCHES +

File patches are available that allow you to upgrade older official editions of
computer-based classic Doom/Doom II games to v1.9, the final 1990s-era version.
In general, these patches correct minor bugs, and may add some functionality to
the game.

These patch files do not work on pirated editions of Doom or Doom II, and they
will not upgrade shareware versions to full commercial status.

IT IS RECOMMENDED THAT YOU CAREFULLY READ ANY DOCUMENTATION SUPPLIED WITH THE
PATCH FILES BEFORE USING THEM.
Before applying patches of any kind, it is recommended that you make sure your
original game disks, CDs or other media are available and are fully functional.
(If not, make a backup copy of the current Doom/Doom II hard drive files before
applying any patches.  Once your game files are upgraded successfully, you can
delete the obsolete backup files.)

The Classic Doom / Doom II patches listed below are sourced from Doomworld.com:
https://www.doomworld.com/classicdoom/info/patches.php

Click a file link below (or right-click and choose "Save file as") to download.

o PC Doom (Doom 1), full commercial/registered versions only:

  11_19drp.exe: Doom v1.1 to v1.9
  12_19drp.exe: v1.2 to v1.9
  16_19drp.exe: v1.6 to v1.9
  18_19drp.exe: v1.8 to v1.9
  19_udpat.exe: v1.9 to Ultimate Doom v1.9
  downgrd.zip: Downgrade/revert v1.9 to v1.1 (Documentation here)
  -----------------------------------------------------------------------------
  Notes: The standard commercial/registered version of Doom has three Episodes.
  Ultimate Doom has those Episodes plus a fourth, titled "Thy Flesh Consumed".

o PC Doom (Doom 1), shareware versions only:

  dm19spat.zip: Doom v1.666 to v1.9
  dms18_19.zip: v1.8 to v1.9
  -----------------------------------------------------------------------------
  Notes: These patches affect only the shareware copies of the game, and do not
  unlock or provide full commercial/registered software or functionality.

o PC Doom II: Hell on Earth:

  16_19d2g.zip: Doom II v1.666 (German version only) to v1.9
  doom2p.zip: v1.666 (dated 8/24/94 or 9/20/84 only) or v1.7 (9/21/94) to v1.7a
  doom2p16.zip: v1.666 (for versions not covered above except 8/25/94) to v1.7a
  doom2p17.zip: v1.7 (for versions not covered above) to v1.7a
  d2_19pat.zip: v1.7a to v1.9
  d2_18_19.zip: v1.8 to v1.9
  -----------------------------------------------------------------------------
  Notes: Upgrading early versions to 1.9 may require applying multiple patches,
  individually and in numerical order (e.g. patching version 1.666 to 1.7, then
  1.7 to 1.7a, then 1.7a to 1.9).
  Note that Doom II v1.666 dated 8/25/94 is not an "official" version, and is
  not supported.
  There are no shareware versions of Doom II.

o Apple Macintosh Doom II: Hell on Earth:

  d2-103m.bin: Doom II v1.0.1 (or earlier) to v1.0.3
  -----------------------------------------------------------------------------
  Notes: There are no shareware versions of Doom II.

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