The Blaster Launcher is a heavy weapon in XCOM 2. Like all heavy weapons, it can only be mounted on heavy armor.
Like the Blaster Launcher in the previous game, this iteration is much more than the standard Rocket Launcher; it deals more damage, has a higher blast radius, shreds more armor, and has a higher effective range. Additionally, the Blaster Launcher fires a projectile that actively navigates around blocking terrain, allowing for many more firing angle options as opposed to the Rocket Launcher. It is useful as an all-around upgrade to the Rocket Launcher.