Not forms specific but you sure can run into this anytime you run oui on windows. And I keep running into this problem: "Exit code of OUI process -1=".
It means that OUI ran into Too Much diskspace. It's the only program I have ever seen in my life that could have a problem like this. As far as I know, the only
way to fix it is to somehow get rid of some diskspace while the program is running. Just ran into it again installing a 12.2c client. Why can't the vendor fix this bug? All my efforts with 12c have run into this.