Advanced Dungeons & Dragons Core Rules 2.0 Cd-Rom Official Errata
The official AD&D Core Rules 2.0 Cd-Rom had some errors in their on-line book. With these patches, it is possible to update the three version of the Dungeon Master's Guide and the Player's Handbook to the latest official TSR, Inc. Errata.
Use the release file: expand it in your AD&D Core Rules folder (the ones with Book, Help and WebHelp folder). Overwrite any file and execute ErrataInstall.bat. It needs the original HLP and RTF file: if you have modified it, please copy them from your expansion CD-ROM and install again the errata pack.
Using the Bpatch program in this GitHub repository (https://github.com/delphidabbler/bdiff) it's possible to patch the help version and the RTF version of the books. Just copying the WebHelp folder to the WebHelp folder in your installation will update your HTML files.
Because the Help and RTF files contains the whole books, and freely distributing them would be a huge copyright infringement.
Thanks to https://github.com/delphidabbler/bdiff for the patching software that works on old Windows systems