Thank you so much, @MC1RScorpion and @herb64 !!! I couldn’t figure out why the x360ce file was not generating the xinput1_3.dll and x360ce.ini files as before. Perhaps it’s because there are so many .exe files in Unreal’s Win64 folder it confuses the application.
The solution, as herb64 described, is to put the x360.exe file into a new empty folder anywhere on your drive, double click x360.exe to launch, then when prompted, create the xinput1_3.dll and let it search for settings for your controller. Customize if desired and finally press Save. Then close the application and paste the contents of that new folder (x360ce_64.exe, xinput1_3.dll, and x360ce.ini) inside the C:\Program Files\Epic Games\UE_(YourVersion)\Engine\Binaries\Win64 folder. Now simply launch Unreal Engine and you are good to go!! 