Hey!
I downloaded the 1.14.4 installer jar (file name is "forge-1.14.4-28.0.13-installer.jar") and ran it several times, the latest log generated below in the spoiler:
After saying that installation has finished, the version does not show up in my launcher, and there is no .jar file in the appropriate versions folder, only the .json, in the spoiler below. If I had to post a log of my first installation, I am unable to get that.
My Java version is 1.8.0_191, and I'm using an old Minecraft launcher; specifically version 1.6.89-j
Thank you!