For one, STOP relying on the 2K launcher, that thing is broken.

Instead, use ALM.

For two: Now how do you get the mod working?
Enable the mod via ALM > Go into the surgery tab > Dissect an alien for parts > Research the alien species further > Gain at least one proving grounds station > Use the proving grounds to recruit aliens.

Note: Robotic units take considerably more time due to their absolute power scaling. For balance though robots like SPARKs cannot pick up civilians or rescue VIPs, so having one human on your squad to do mission-related tasks, and having them protected by SPARKs is recommended.