Failed to launch is a generic error so could you please provide the following info:
Do you have any LastException files in Documents\Electronic Arts\The Sims 4 ?
- Delete the ones you have
- Trigger the error again
- Check if new ones are created
- If that is the case, please copy/paste the content here. You can open the file with any text editor.
Deleting the file won't fix your issue. Posting the info is meant for troubleshooting.
Could you post your Computer's DxDiag?
- Press Windows-Key + R
- Type: DxDiag
- Click on Save all Information.
- Attach the Text File to your post
Does it now crash right on start or still mid game ?