1.7 Update:

General:

-Added knives to melee spawns (this was supposed to be included in the previous update)
-Keeping with the "derelict military structure" theme, many firearms may now spawn with a "worn" appearance
-Some minor filesize/performance optimization

Level 1 (Loading Dock):

-Fixed some light fixture models using wrong skin
-Removed two decals next to the saferoom that "spilled" over to the metal wall

Level 2 (Operations):

-Decal fix identical to the previous level
-Slightly tweaked item spawning

Level 3 (Train Depot Finale):

-Improved finale hints
-Fixed nonfunctional infected-only climb
-Multiple bot navigation improvements in and around the finale area
-Fixed several locations where bile bombs could be exploited
-Some visual improvements and fixes in the finale area

1.6 update:

General:

-Added support for Last Stand content
* CS weapons and shovels can now spawn throughout the campaign
-Changed mission name from "CSProdidy" to "CSProdigyForL4D2" (now in line with other campaigns in the series)

Level 1 (Loading Dock):

-Removed a broken decal from near the saferoom (also applies for the next level)

Level 3 (Train Depot Finale):

-Minor performance improvement

1.5 update:

General:

-Fixed a potential crash related to stringtable dictionaries
* NOTE: This issue can still persist/re-emerge if you have lots of add-ons (or several very large ones)!
-Fixed console error message caused by a missing bracket in the mission file
-Added a new loading screen
-The maps are now numbered in the level selection list
-Fixed an exploit related to pipebombs/boomer biles that was present in every level
-Few minor performance improvements in every level

Level 3 (Train Depot Finale):

-Several improvements to the escape train:
* The engine has a new, more detailed collision mesh (and it now acts like metal rather than plastic when shot/walked on)
* Common infected and Tanks will now attempt to climb on the engine in a more realistic fashion if their target is standing on it
-The openable boxcar now also has proper physical properties
-Several small visual fixes

1.4 update:

Level 1 (Loading Station):

-Fixed an issue that caused the wrong soundscape to play

Level 3 (Train Depot Finale):

-Added 3 new lines for survivors to say when the the train can be boarded
-Fixed bots not being able to get on top of the train engine
-Fixed a rare issue where infected bots could block the train permanently during the outro sequence

1.3 update:

General:

-Fixed few individual spots in the campaign spawning "generic" common infected

Level 1:

-Removed an infected-only ladder that may have been the cause of frequent crashing in the level
-Tweaked the nav mesh further to improve bot navigation
-Added an additional chainsaw spawn point

Level 2:

-Heavily improved bot navigation with ladders
-Minor nav tweaks

Level 3:

-Ladder navigation improvements similar to those in the previous level
-Fixed some hidden areas not spawning special infected
-Minor nav tweaks and improvements

1.2 update:

Level 1:

-Reverted a nav tweak that could potentially crash the game

1.1 update:

Level 1 (Loading Station):

-Moved the Magnum pistol spawn from near the safehouse to the rescue closet just before the train loading hall (this also means that Survivor bots will no longer ignore the item)
-Various minor nav improvements

Level 2 (Operations):

-Fixed infected not making use of the vent system
-Fixed minor console spam caused by missing textures
-Fixed a potential exploit involving standing on top of a certain pipe where that the infected could not reach
-Fixed some overlays not appearing in the inaccesible area near the starting safehouse
-Other minor visual improvements and fixes

Level 3 (Train Depot Finale):

-Removed the vent system in the first room (was supposed to be a horde/special spawn point, but never worked)
-Removed some redundant logic entities used by the previous version of the finale
-Added two new item spawns in the finale area
-Fixed one light prop using the wrong skin
-Minor nav improvements