Game won't load after downloading Sims 4 Cats and Dogs?!

@MoonYuzuki  Yes, that's exactly it, thanks.

There are a few different issues in your dxdiag.  The first is that Windows is failing to update.  Please try to run any pending updates manually.  Click the Windows icon in the lower left corner of your screen, select Settings > Update & Security, and click the button to check for updates.  If there are a number of them pending, it may take several tries to run them all, so be sure to keep clicking the button until Windows doesn't find any more updates.

It's also a good idea to run a couple of checks on your Windows system files.  Here's how:

• Hit Windows key-X
• Choose either “PowerShell (Administrator)” or “Command prompt (Administrator),” whichever option is offered
• Inside the window that appears, copy and paste “DISM.exe /Online /Cleanup-image /Restorehealth” without quotes into the window, and enter
• The system will start validating soon. If it throws an error, please list it here
• After it reaches 100%, hit Windows key-X again
• Again, choose “PowerShell (Administrator)” or “Command prompt (Administrator)”
• Inside the window, copy and paste “sfc /scannow” without quotes into the window, and enter
• Post the message you receive here

Now try launching Sims 4 a couple of times.  If it doesn't work, move your entire Sims 4 game folder out of Documents\Electronic Arts and onto your desktop, and try again.  (This will create a clean folder with no content; please don't add anything to the folder until you've tested a couple of times.)  If the game won't run even with a clean folder in place, please run another dxdiag; I want to see whether there are any new errors.