Do a clean reinstall:
Remove the game from Steam (uninstall)
Manually delete all these files and folders, if still there:
…\Steam\steamapps\common\Cities Skylines II\
…\AppData\LocalLow\Colossal Order\Cities Skylines II\
(first move the /saves/ folder elsewhere to keep your save games)
(To see the AppData folder you'll need to enable View Hidden Items in File Explorer)
Remove the game from Steam (uninstall)
Manually delete all these files and folders, if still there:
…\Steam\steamapps\common\Cities Skylines II\
…\AppData\LocalLow\Colossal Order\Cities Skylines II\
(first move the /saves/ folder elsewhere to keep your save games)
(To see the AppData folder you'll need to enable View Hidden Items in File Explorer)
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