How far do you get? Do you see the launcher after pressing Play in Steam? Does anything happen after pressing Play in the launcher? Or does nothing seem to happen when pressing Play in Steam?
Windows
\SteamApps\common\Cities_Skylines\Cities_Data\output_log.txt
Mac OS X
Users//Library/Logs/Unity/Player.log
Linux
~/.config/unity3d/Colossal Order/Cities: Skylines/Player.log
As we can't attach files here on Steam, you will need to upload the file somewhere else. Here's a few sites you can upload it to, which do not require you to sign up first:
https://uploadfiles.io/ -... Read more