When I quit my current version of InDesign, it acts like it crashed involuntarily. I have been ignoring that. But I also want to make sure I have all the current applications, and that would require Application Manager to work. When I launch it, a little grey box comes up that says it is initializing the installer, then it crashes. I love my Creative Cloud, but I don't like crashes.
A chat session where an agent may remotely look inside your computer may help
Creative Cloud chat support (all Creative Cloud customer service issues)