The 1.5 patch is an unofficial patch which isn't available for Linux or Mac IIRC. The unofficial part may be why they didn't/couldn't change the version on the exe. At least back in the day, 1.4 official was the only version ever used for multiplayer with the sole exception of the very rare Olympus Gold game which would crash without the 1.5 patch. For singleplayer or for multiplayer with Windows/WINE users, 1.5 probably makes sense as I think it has better stability on modern operating systems. For Linux/Mac you still have no other choice.
Creative Labs OEM Version 1.2 bundled with Sound Blaster Live! X-Gamer (Model SB4760X)Disk One is labeled: CD-C95-778-C2E, CLI Part No. 1713310386-1Disk Two is labeled: CD-C95-778-C2E, CLI Part No. 1713310387-1Installing the Descent 3 Mercenary Expansion Pack will upgrade the version to 1.3.1 Build 567.This version can be patched directly to Version 1.4 with the d3140us.exe U.S. patch.Version 1.0 (Dual Jewel/Australian)Disk One is labeled: CD-C95-778-2Disk Two is labeled: CD-C95-778-3Installing the Descent 3 Mercenary Expansion Pack will upgrade the version to 1.3.1 Build 567.This version can be patched directly to Version 1.4 with the D3_AUS_1.4_Patch.exe Australian patch.Version 1.0 (U.S.)Disk One is labeled: CD-C95-778-0Disk Two is labeled: CD-C95-778-1Installing the Descent 3 Mercenary Expansion Pack will upgrade the version to 1.3.1 Build 567.This version can be patched directly to Version 1.4 with the d3140us.exe U.S. patch.
Some notes I have for my CD-ROM copies:QuoteCreative Labs OEM Version 1.2 bundled with Sound Blaster Live! X-Gamer (Model SB4760X)Disk One is labeled: CD-C95-778-C2E, CLI Part No. 1713310386-1Disk Two is labeled: CD-C95-778-C2E, CLI Part No. 1713310387-1Installing the Descent 3 Mercenary Expansion Pack will upgrade the version to 1.3.1 Build 567.This version can be patched directly to Version 1.4 with the d3140us.exe U.S. patch.Version 1.0 (Dual Jewel/Australian)Disk One is labeled: CD-C95-778-2Disk Two is labeled: CD-C95-778-3Installing the Descent 3 Mercenary Expansion Pack will upgrade the version to 1.3.1 Build 567.This version can be patched directly to Version 1.4 with the D3_AUS_1.4_Patch.exe Australian patch.Version 1.0 (U.S.)Disk One is labeled: CD-C95-778-0Disk Two is labeled: CD-C95-778-1Installing the Descent 3 Mercenary Expansion Pack will upgrade the version to 1.3.1 Build 567.This version can be patched directly to Version 1.4 with the d3140us.exe U.S. patch.
For whatever it's worth Linux/Mac support isn't on the table ATM since it's an entirely different beast than Windows, requiring the use of entirely different POSIX APIs to do the memory patching I'm doing. Hypothetically these things should work in WINE, though my little C# configuration program would need Mono. I don't really have anything left to do beyond doing a final check over the source code and then releasing this thing to people where it will surely explode in 3 minutes because I failed to account for something and it just crashes on everyone's machines... gee I sure have a positive outlook on development. In any case, I'm sticking with my plan for supporting EU 1.4 and GOG 1.4 at the moment, and I'll expand things to other versions later, but without any other option (beyond trying to get my CDs working), I'll have to ask people to donate executables for testing.