This is a bug fix version, fixing the following bugs:

• The AI turn can hang, if they take grenade damage during there own turn
• Movement of physics objects goes slow if PC cannot run game at 60 FPS
  
• Soldiers kicking door splinters causes violent acceleration
• Avoid collisions when calculating move
• Improved splinter sounds. 
• Improved path creation
• Remove splinters stuck in other objects
• Soldiers hit by door splinters take more damage
• HUD does not update properly after taking a shot

Note: the Windows version has been switched to 64-bit for performance reasons.

Previously, 1.5.1 fixed the following bugs:

• AI soldier can move through unseen character
• Pathfinder doesn't update when door opens/closes, resulting that a soldier can get stuck behind door
• AI can accidentally throw a grenade onto roof when trying to hit the enemy
• When a soldier spots the enemy all undo's are disabled for whole team (to avoid cheating)