
Here is Commander Keen 1 Gold Edition, A.K.A. pseudo-version 1.35 since it's unofficial fanmade tribute (last official is 1.34). It's an updated and enhanced version of the original game with new levels + old levels with fixes, edits.
So here it is: https://www.dropbox.com/s/ezzj3bp1ld9hn ... D.zip?dl=0
Demo: https://youtu.be/R8nE7qwViTw
Note that this gold edition has been divided into two parts due to the regular numbering of the levels (because of this, the mod was 31, so there are part A and B for this to have 16+16 separatedly. For more info read Readme.txt.

EDIT: If somebody doesn't know, Keen 1 Gold A contains the original Keen 1 levels with some tweak and bugfix + updated worldmap. Gold B contains the same, except there are +16 additional levels.