Q:What happened with the techonlogy tree ?
A: Many technologies are locked, show in other color in the end of the techologies list. They are unlocked once you complete certain missions. A mission may be spawned for a locked technology if you have already researched its prehequisites.

Q: I want to remove the mod, but it seens that technologies are still locked. How do I fix this ?
A: You will need need to run this command on chat console to unlock technologies:
/c for name, tech in pairs (game.forces.player.technologies) do if tech.visible_when_disabled and (not tech.enabled) then tech.enabled=true tech.visible_when_disabled=false end end