When I installed this mod, I also encountered crashes. The game needs to be patched. It was just difficult to find the patcher.
By the way, you can also patch the game for regular gameplay without this mod – the game will be able to use more RAM, and the lag in cities will disappear.
If I have time, I'll post a link to the patcher later.
Below is a translation of one of the comments about the mod:
"It is quite possible that the game is running out of memory. It is probably necessary to download and apply Large Address Aware to the game's executable file."