So, I'm back, and now I've started to restore source code.
Possibly, I will finish the main campaign story and open some SDK-kit for not indifferent mappers, who can introduce custom coop campaigns in this "creation".
Comrades, I need some time. That was a really hard challenge for me to create a similarity of coop-mod 7 years ago, after which I abandoned HL-modding.
But I promise, I will make it.