INHEAT 0.75 Legacy Build HF, is their last build version of their game, because they going to remake a new one, with new models and stuff.
The Electra video system test, was something they tried to make fixes to the video tapes in the game. Its in the development log's about it.
The Linux version is a old build they never updated for Linux players for the latest build, which is the Legacy build im talking about.