Because SC:Blacklist is a game that was never intended to be modded, I highly recommend reviewing the info in the readme before using the mod. Also, check out the change logs for the changes that have been made since release. When launching the game with the mod for the first time, the game may crash. This is normal - you may have to launch the game a couple times for it to work.
v5 Changes
For a more detailed change list, check out the change logs included in the download.
Included a separate file for "hardcore" mode where both you and enemies do 4x the amount of damage.
Improved the performance of "special" weapons, I think I went overboard with their nerfs before.
Ops suits further standardized
Replaced the Prototype Pistol with the MAC-11
Restored sonar sensors for the tri-rotor to make it a more effective spy device
Many weapons and ops suits have been tweaked, check out the armory page for more info.
Be cool if you can actually look down the sights on all the guns.
I've been playing around with that a bit but can't make up my mind, if you want to test it out and tell me what you think I could always use a second opinion.