Hi reimazdan, It's a little hard to give you any information or suggestions with so little information. Please can you provide a detailed account of the process you followed, the errors messages you received and if possible screenshots of any issues. The generic info on how to install is to install from steam library as you would with any other Steam game. On the first run you should see the config box for setting display adapter settings and resolution etc. If that's not the case you can run it manually by right clicking on Automobilista in the games list of steam and choosing the config option. After that you should be able to launch the game by hitting the play button or double-clicking Automobilista in the games list as with any other Steam game.
Add Automobilista installation folder to antivirus exceptions, validate files through Steam and retry...
