In this circumstance, if the user receives a message which states 'An error occurred while updating Football Manager 2018 (content file locked)' or 'Disk Write Error' then we would suggest uninstalling and reinstalling Steam. Details on how to do this here - https://support.steampowered.com/kb_article.php?ref=9609-OBMP-2526 If you have a large number of other games installed via Steam, we'd suggesting backing up before completing the install. We'd suggest uninstalling Football Manager,