January 2019 - last edited January 2019
thanks aleks1609 (previous comment before mine), finally the only real solution which works just as steam's file checking
the pause unpause way is just not worth it for people with slow hdds
the Download button way is just not working for people which free disk space is lower than the game's size
the reload game library way does nothing
but yours works.
February 2019
To fix it you can just click the settings cog and click locate game. From there just find the file of the game you want and let it verify the files.
May 2020
July 2020 - last edited July 2020
Another simple solution is:
August 2020
if i do locate game then it just crashes origin on a loop