Admittedly, I\'m a newbie on the Apple / Mac ecosystem...
On Max OS X, the default install from Qt Disk Image installs to the user\'s home directory (/Users/whoami
Maybe this is what you want:
First off, if you don't already have it, get homebrew. It makes installing and updating certain applications/programs really easy. A helpful external tool (cask) can also be installed for more generic .app bundles. This includes qt creator and probably does what you want.