EA App not working on Windows 10

OldeSimsFan​  Try a Revo uninstall again, and if you get the option to repair, choose it and then run Revo immediately afterwards.  And if you use a third-party antivirus, disable it while doing this.  As long as you don't do anything else at the same time, your computer should be safe.

The fact that Revo couldn't find the app but the installer did suggests something is breaking the app soon after it's installed.  An antivirus is a good possibility but not the only one.

If this doesn't help either, restart your computer and delete the EA Desktop folder inside C:\Program Files\Electronic Arts.  If you get a message that you can't because something is open already, kill anything EA-related in the Task Manager, including in the background processes list.  Then reinstall the App.

Every time, run the App installer as an admin: right-click the download and select "Run as administrator."

williamabo​  Using the Steam version wouldn't get around the requirement to use the EA App and could only complicate things further.