Your checksum looks to be invalid. Please check first that you are opted out of any betas of the game (Right click on EU IV, go to properties > BETAS and select "None - Opt out of all betas").
If that did not work, do a full clean install of the game, including removing the Documents\Paradox Interactive\Europa Universalis IV\ folder. Make sure to copy the save games folder to a different location, or you'll lose these.