The entire Darkmod 2.12 download in one archive. No need to run tdm_installer.
Simply download and extract "anywhere" (except "Program Files" or other privileged folders)
in your filesystem then make a shortcut to either TheDarkModx64.exe on Windows or thedarkmod.x64 on Linux
No need to run installers or updaters.
Note: TDM only officially supports 64-bit builds now.
32-bit builds are included in this archive "TheDarkMod.exe" ( Windows ) and "thedarkmod.x86" (Linux) and will probably play all but the largest missions but are considered unsupported on 32-bit.
Also, all tdm_installer version ( Windows, Linux, 64-bit and 32-bit ) are included in the archive so you can easily upgrade to the next version when available.