i have exactly the same problem!
I have also reinstalled everything, Windows & iTunes ok, but MM message: "An iPhone connection was detected. Please install iTunes in order to sync this device."
I tried too CopyTrans, but CopyTrans can also not connect to the iPhone.
My configuration: Windows 7 / iPhone 6s (iOS 12.4) / MM 188.8.131.523
I do not know how to continue