Currently, when someone installs jEdit from debian packages, or if a superuser installs it to c:\Program Files\, then regular users can not use updater to update the program. It fails because that file system is readonly for regular users.
Updater should check the permissions, and then if it's readonly,
A dialog should pop up that says "Updater (Java actually) does not have adequate permissions to do this. Would you like to Install to a different folder, or cancel? "
At which point, it should allow the user to cancel or supply a different location to install/run jEdit from.