Depending on which version you are looking for, here is how you can legally access it: AirStrike for Windows - Download it from Uptodown for free
You can choose from 10 different helicopters , each with unique stats, and equip them with over 10 powerful weapons , including plasma cannons and flamethrowers. air-strike-pc-game-free-download-full-version
AirStrike 3D is a vertically scrolling shoot-’em-up that places you in the cockpit of advanced military helicopters to take down a terrorist organization named N.I.T.O.. Depending on which version you are looking for,
The game features 20 large levels across 5 types of hostile terrain, such as deserts and snowy mountains. each with unique stats