Hello, please upload your Player.log to help us find the issue. Maybe these solutions can help you. I would appreciate if you could report back if either of these worked for you!
To fix corrupted files that are on your local machine:
1. Go to C:\Users\[your user name]\AppData\LocalLow\Colossal Order\Cities Skylines II
2. Either rename the Cities Skylines II folder or move it to another place on your computer. If you delete it be aware that your local saves will be deleted as well.
3. Start the game again, if you had corrupted files locally you should be able to get into the game now
4. To recover your local save files, go to the initial folder that you either renamed or placed somewhere else and find the Saves folder. In there there is a folder with a bunch of numbers, open that folder and you will find your local saves. Copy the .cok and .cok.cid file for the save you want to use and paste it into the new Cities Skylines II folder that was created when you started the game in Step 3.
If you are still having issues you might need to recover your Steam Cloud as the corrupted files might be located there. To do that, follow these steps:
1. Go to https://store.steampowered.com/account/remotestorageapp/?appid=949230 while logged into the same account used to play CSII with
Download all the files that the user wants to preserve to a safe location outside of the game user folder. Like C:\SteamCloudBackup or just their Downloads folder if they are not too precious saves.
2. Reset the steam cloud, this unfortunately may reset some achievement progress tracking and paradox login+friends of chirper entitlements will be reset if owned. It will be necessary to log in the paradox account again to re-unlock them.
Start the game with the command line toggles
--developerMode --qaDeveloperMode (game properties>General>launch options)
In the main menu, press Tab and navigate to Platforms
Expand Remote storages and press `Wipe data` under the Steamworks entry (this will irreversibly delete all the content on the steam cloud so make sure to have downloaded the things wanted to backup)
Remove the launch options from properties, or at least --qaDeveloperMode as it exposes some dangerous operation that can wipe data unnecessarily
3. Restart the game, confirm the game works locally
4. (optionally) The downloaded save games from step 1 that are not corrupted can be recovered
Close the game
Copy the cok files of the desired saves to Cities Skylines II user folder (it can be at the root and the file will remain read-only or into Saves/<userSteamId> and it will behave like a local save)
Start the game, load the desired save game, save to Steam cloud again.
Corrupted files that show an error with reads out of bounds or missing central directory are unfortunately completely broken and these can not be recovered.
To fix corrupted files that are on your local machine:
1. Go to C:\Users\[your user name]\AppData\LocalLow\Colossal Order\Cities Skylines II
2. Either rename the Cities Skylines II folder or move it to another place on your computer. If you delete it be aware that your local saves will be deleted as well.
3. Start the game again, if you had corrupted files locally you should be able to get into the game now
4. To recover your local save files, go to the initial folder that you either renamed or placed somewhere else and find the Saves folder. In there there is a folder with a bunch of numbers, open that folder and you will find your local saves. Copy the .cok and .cok.cid file for the save you want to use and paste it into the new Cities Skylines II folder that was created when you started the game in Step 3.
If you are still having issues you might need to recover your Steam Cloud as the corrupted files might be located there. To do that, follow these steps:
1. Go to https://store.steampowered.com/account/remotestorageapp/?appid=949230 while logged into the same account used to play CSII with
Download all the files that the user wants to preserve to a safe location outside of the game user folder. Like C:\SteamCloudBackup or just their Downloads folder if they are not too precious saves.
2. Reset the steam cloud, this unfortunately may reset some achievement progress tracking and paradox login+friends of chirper entitlements will be reset if owned. It will be necessary to log in the paradox account again to re-unlock them.
Start the game with the command line toggles
--developerMode --qaDeveloperMode (game properties>General>launch options)
In the main menu, press Tab and navigate to Platforms
Expand Remote storages and press `Wipe data` under the Steamworks entry (this will irreversibly delete all the content on the steam cloud so make sure to have downloaded the things wanted to backup)
Remove the launch options from properties, or at least --qaDeveloperMode as it exposes some dangerous operation that can wipe data unnecessarily
3. Restart the game, confirm the game works locally
4. (optionally) The downloaded save games from step 1 that are not corrupted can be recovered
Close the game
Copy the cok files of the desired saves to Cities Skylines II user folder (it can be at the root and the file will remain read-only or into Saves/<userSteamId> and it will behave like a local save)
Start the game, load the desired save game, save to Steam cloud again.
Corrupted files that show an error with reads out of bounds or missing central directory are unfortunately completely broken and these can not be recovered.