No worries, so your save file should just carry over to the next version assuming your txt. file that the game generates (somewhere in your Program Files x86) by default is still there. The game will just read that so you should be fine.
As for the roach, he's just supposed to serve as a way to guide the player into playing Black October if they haven't already, since some players may not try exploring that section of the game prior to talking to him. So, if you've completed Black October already, you're done as far as the roach is concerned.
Very glad to hear you enjoy it by the way :)