Big update:

Huge shout out to DannBo for detailing, remastering and reworking several areas of the campaign. This new version includes a lot more new details, custom dialogue and map changes that benefit the campaign as a whole. See below for a more detailed changelog.

All maps:
Added survivor dialogue
Added/tweaked directional lighting and decal arrows to help with navigation
Extensive prop/overlay/displacement detailing* Optimization (in particular, reducing amount of world rendered at a time)
New higher-res loading screen poster
Fixed fitness center ads, neon signs, and arcade machines to properly glow/self-illuminate
Fixed buggy reflections/specular maps on custom props
Fixed buggy bump maps on custom textures
Improved clipping around props to prevent players getting stuck/trapped
Fixed/Added additional infected ladders to some areas
Tweaked tank spawns

Map 1:
Fixed collision stick-points between escalator railings and ceiling.
Replaced cramped single escalator after the gym event with a stairwell with a bit more room to manoeuvre.
Added health items and ammo to the sideroom upstairs after the gym event.

Map 2:
Added areaportalwindow in front of flaming hallway to allow for a fade-in rather than pop-in.
Fixed event script not transitioning into slightly less intense waves after the first few seconds.
Added a few potential health item spawns near the event area.
Fixed breakable vents falling out of the ceiling whole instead of breaking.
Added custom nightclub ambient soundscape with music (City Night Lights by Bad Snacks via YT Audio Library)
A witch is now guaranteed to spawn on the dance floor in addition to the other spawns in the map.

Map 3:
Added closet outside starting saferoom with item spawns and potential spawn points for special infected.
Added room above alley that infected can drop out of / smoke from across from broken wall the survivors have to pass.
Added elevator shaft w/ infected ladder next to stairwell as a potential hazard for survivors to get charged/jocked into from the top.

Map 4:
Finale area is now an extensive "quarantine zone" surrounded by large metal barricades that the survivors break into, setting off the horde inside.
Finale entrance area was restyled as a military outpost just outside the quarantine zone with health and weapons moved to a platform in between two flood gates.
Survivors open the second floodgate to start the gauntlet. This door opens more slowly allowing the horde to build up a bit before survivors can start progressing.
Distant alarm now sounds throughout the gauntlet, though difficult to hear over hordes so as not to distract/irritate players.
Tweaked gauntlet scripts to slightly reduce quantity and persistence of zombie mobs, allowing survivors a little bit of breathing room when players become incapacitated.
Modified construction area to utilize space more effectively as a hold out area to fight the tank, and moved the ladder to an easier to spot location.
Added guaranteed item spawns to the construction area, particularly just before getting onto the bridge.
Survivors should now cling to the side of the construction area where it meets the bridge if they slip off, instead of immediately falling to their death.
Pushed trigger to ramp up horde earlier on the bridge so that horde starts up sooner if survivors try to push past tank.
Added some additional fencing towards the end of the bridge section to make it slightly less of a death trap for survivors trying to hop across.
Using the radio now produces dialogue with the chopper pilots.
If a survivor becomes incapped before dropping down to the last fence, survivors can now progress forward to the chopper without having to wait for the incapped survivor to die.

Hotfix of map 1 crashing issue.

Map 1:
Added more infected ladders at mid-section
Added ladder to back of truck on road
Disabled collision of a few lights by the escalators.
Updated Nav Blockers inside the gym to maintain proper nav flow.
Clipped outside of the gym to prevent skipping the event.
Clipped gym prop that could be used to skip parts of the gym event.
Added auto crouch triggers to tops of escalators railings to prevent players getting stuck.

Map 4:
Added additional melee weapon spawns
Added more infected ladders to construction site
Added additional heal items spawns at construction site
Added a few more throwable item spawn locations
Added some more possible gas tanks spawns
Fixed infected ladders that sometimes would be hard to climb

Hotfix Update.
Campaign and Content pack should no longer say "Conflicting files"

Map 1:
Added Survival mode inside the Fitness Center.
Adjusted a few nav blockers for smoother bot movement.
Fixed missing graffiti in the ending saferoom.
Added custom graffiti.

Map 2:
Added Survival mode inside the Plantation Section.
Moved one weapon inside the starting saferoom, so it doesn't spawn inside another weapon.
Fixed missing graffiti in the starting saferoom.
Added custom graffiti.

Map 3:
Added Survival mode inside the Subway Section.
Added custom graffiti.

Map 4:
Added additional arrows to make it easier to follow the path.
Added more fire barrels that illuminate the correct direction.
Added custom graffiti.
Fixed floodlight prop having the wrong skin.
Fixed truck where the spotlights didn't show properly.
Added lights to military vehicle next to gauntlet start and the one a bit further down
Added a strong floodlight to the construction site building.
Moved tank spawns slightly, to incentivize survivors to go backwards instead of forward while fighting the tank.

Map 1:
Boomer Bile spawn density increased.
Clipping improvements

Map 2:
Boomer Bile spawn density increased.
Fixed previous saferoom door flickering.

Map 3:
Boomer Bile spawn density increased.
Changed door on ground from rotating to a static.
Fixed saferoom door not having a checkpoint (bar)
Fixed visual glitch at hole in scaffolding.

Map 4 changelog:
Boomer Bile spawn density increased.
Fixed gauntlet sometimes starting early due to a door glitch.
Added additional grenade spawns.
Nav improvements.
Added rebars between construction building and bridge to prevent instant fall to death.
Replaced double tank on bridge to a single tank.
Last stretch of the finale only spawns 1 tank, usually in the back. Random.
All gauntlet scripts have been adjusted and made a bit easier. Still challenging though.
After reaching close to the construction site, the horde is slightly smaller and spawns at a slower rate to let players reach the bridge slightly easier.
In Coop - tanks now only spawn on the actual bridge and not on the sides. This to prevent instakills with cars before players react.