I'm learning how to run a dedicated server and started with this map, which is complex, to see how well it works with 100+ plugins on server side and many mods on the client side.
I have been taking notes and screenshots while testing the functionality of the plugins and the server that I think can be helpful to both the author and the players.

Since it's long I'll break it into comments or update this comment as I go through the chapters

FIRST STAGE, I noticed that there is a small game console in a room at the beginning linked to a first aid kit. Whoever picks up the medkit will have the console permanently linked until the medkit is used. Although this console does not appear if the stage is restarted. Don't use the medkit, reserves it, the console kills the enemies around you, is a good help. There is some consoles more throughout the game, with the same mechanic (linked to a medkit).

When I went to the first house outside, I realized that the bots are unable to follow me to that area. And if I teleport them, they are unable to get out. There are no navigation zones between one point and another. That also applies to the infected.
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2809443449
A little further on, there is a corner from which a large part of the wall can be traversed by an invisible curb inaccessible to enemies and bots.
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2809444544
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2809444595
After a long and confusing path (confusing not as a criticism, I love getting lost in the woods surrounded by zombies) through the dam and the field, I manage to reach some tracks where I activate a train... and it doesn't tell me what to do. You have to run to the end of the train AFTER ACTIVATING THE SWITCH because the door will have opened. Making your way LOOOOONG to the tail of the train before activating the switch is useless, and there are no useful objects around, it is much better to fight near the switch, where there are infinite medkits and ammo (in my opinion very well placed, the stage is long and very hard).
By the way, I suggest to the author of the map to turn off at least half of all these lights, remember that it has been 10 years since the epidemic... And it will considerably improve the performance of that stage with less FPS drops or crashes:
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2809444649

SECOND STAGE, oh, the train... Spectacular views of the train and very original all the missions, but managing the bots is a nightmare, and not because they are stupid, but because the navigation on the train is bad. That also affects enemies, in the official walkthrough you can see a scene where the author fights a tank stuck between two train cars.
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2809444735
I propose two solutions, one involves the player and one the author. To the player, use bots wait and bots warp with Left 4 bots to stop and warp bots. Every time you get off a wagon to cross a wagon without cabins or the roof, stop the bots inside the wagon with cabin, and warp to you when you reach another cabin. Be careful not to get caught by the specials, or the bots will come to your rescue (if you have it configured) and they will fall. Remember that the specials are also dumb on that part of the train, so they won't get too close to you and you can be forewarned.

The author's solution involves creating better navigation connections in that part, which do not go beyond the edges of the train. If it's too hard or doesn't work, I suggest that the bots don't die when falling out, just get incapacitated by losing health. This will allow players to teleport them to rescue them.

A fight with a tank on a train can be tough, but it's spectacular.
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2809444850
There are some tables on the train like this where if the bots get there by being pushed by enemies or their own teammates, they can't get back out. If a player gets on that table, the enemies cannot reach him, it is a safe place where only the spitters can attack him. This doesn't happen on all tables, some yes, some no.
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2809444935
The helicopter...
I think I'm the only one who's seen this technique used, I've been revealing it in comments from other campaigns, and I say it here too. Bots can be made to crouch with the command sb_crouch 1 (needs sv_cheats 1, although if you have sourcemod you can do it even without cheats enabled). What I do is assign it to a button:
Where "A" you can put any key. Each time you press this button, you'll tell them to crouch or stand up, respectively, with vocalizations for all players to hear. This is the result:
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2809445035
In addition to asking them to crouch, you will have to tell them to stop ('bots wait' with Left4bots), so they don't get out of the boxes fighting with the zombies coming.
That part of the train has better navigation and they won't fall to get there, but still be careful.
I managed to beat the helicopter by shooting it myself, but the bots don't know how to shoot vehicles. I suggest that the HP of the vehicles change according to the number of players. The more HUMAN players, the more HP.