The m3sa beta has updated changes that m3sa (one of the only developers left) has made to the game. The most notable changes being to New Alaska making it much better. Unfortunately the developer didn't have the raw map files and had to decompile and recompile the maps to be able to edit them. Which caused some maps to be broken and missing things they should have.

Some levels in the m3sa beta are corrupt and crash as soon as loaded (the second level of C-17 as an example) and some levels are broken in other ways (the start of chapter 3 is just broken and the train level is missing triggers making it impossible to finish). Which is why there are no runs for it as its unbeatable without modifying the games files or cheating.