The doom3linux1.3.1302sdk.x86.run file you have requested: Official Releases / SDKs / DOOM 3 SDK for Linux - 10.49mb is not available. Perhaps try browsing all files for the game Doom III and upload any files you want to share or are missing. This is the only information we could locate:
The updated SDK includes the source code for the RoE gamecode. You may want to check this page to get detailed info about its content.