Recently on my Macbook Pro, Vuze kept prompting me to update, but for some reason halfway through the install it would say:
Applications/.install4j/inst_jre.cfg Could not create this file. Should I try again.
I had to search around and thought that it might be a permissions issue kinda like Windows where you run as Administrator. I also thought it was odd that it never asked me for my username/password.
Long story short, to make sure that it updates, you must delete that folder, I used console to delete it.
sudo rm -R .install4j/