This patch shouldn't affect too many mods, but some are likely to need updating, meaning your city won't load/work like it usually does. But don't worry, most mods update pretty quickly or can safely be removed, so you are unlikely to lose your city.

Patch notes[forum.paradoxplaza.com]


If you don't use any mods from the workshop or have been through patches before you likely know the drill and this post won't really be useful for you. It's intended to help players who aren't used to mods and patches through the update as smoothly as possible. If this is still all new to you and you have questions feel free to ask and I’ll answer them as best as I can.

• Check the list of broken mods below
  
• Wait for mods to update - or help see what mods needs updated.
  
• Save as a new file if you do open your save! Just in case some smaller issues are discovered later.

Most likely yes, but it might be a few days depending on what mods you use.

Most likely yes - a lot of our awesome modders are working hard to get everything up and running again. But some mods will need larger fixes and as modders only have their free time, we might wait a while for some of them. Now is a great time to tell them how much we appreciate their work! And if there are already several comments mentioning the mod is broken, you don't need to comment. The modder knows and will update when they can.

Loading Screen Mod and Loading Screen Mod [Test] just updated. So far no new mod issues have popped up, but I still recommend saving as a new file just in case.

https://docs.google.com/spreadsheets/d/1mVFkj_7ij4FLzKs2QJaONNmb9Z-SRqUeG6xFGqEX1ew/edit?usp=sharing

I don't have a complete list, but generally mods that add a network like Network Extensions 2, More Train Tracks, Metro Overhaul Mod, One Way Train Tracks and Extra Train Station Tracks are needed to load a city once you have used the networks they add in your city. If any of these are broken you'll have to wait for them to be fixed to load your city again. 81 tiles is another mod you'll need to wait for to be updated if you have used it.

Then there are mods like Traffic Manager: President Edition, any mod that changes population numbers (like Realistic Population and Consumption), Ploppable RICO / Plop the Growables, which you can load your city without, but it's not a good idea as your city will be chaotic at best and fall apart at worst.

A good way to determine how much you need a mod is to think of what it does. If it makes some big changes to how things work in game, removing it will cause problems. If it's something that makes things more convenient for you but doesn't really change how things function once in your city, it isn't a big deal to get rid of.