I have done this; I have been running the vanilla version for months now. I also delated vanilla version for it to recreate that file and it still will not create a .jar file for forge. this is the first version of forge I had this issue with.
I am using the official launcher this is what come up when I select the forge version. There is no .jar file installing in the versions folder for forge.
I have been trying to set up forge 1.12.2 - 14.23.1.2555 I keep getting Launch Failed, When I go into the versions folder it appears the installer is not creating a .jar file.