The 17.1.1 patch merely addresses a stability issue related to starting a career game in Sweden.
Released: 10 November 2017
As usual the update is save game compatible, so you don't have to start a new save game to apply the fixes.
To update you will need to close down Football Manager 2018 and re-launch for it to update. If this does not work for you or you feel it has not updated, you will need to restart Steam.
Even if that doesn't do the trick, then verify the game cache will.
For any feedback in regards to this update, please use the official FM18 Feedback Thread (requires free membership on Sports Interactive forum).