Upgrade JDeveloper from 11.1.1.2 to 11.1.1.3 - any ideas?

Tried to upgrade jdev on OSX where I have 11.1.1.2 running happily... get the following wonderfully useful error message: The product maintenance level of the installer (blah blah 11.1.1.3) is not compatible with the maintenance level of the product installed on your system (blah blah 11.1.1.2)

I'll post a solution if/when I find one...

[EDIT: Thanks Shay - choosing a new directory to install JDeveloper does indeed work. I'm not so sure upgrading should really require a 1.5GB download/full install into an alt. directory instead of having some sort of auto-update type feature, but at least it's working. I'll admit it's nice to not worry about dependencies. As for the Maven plugin(developer preview), I'm installing it now and crossing my fingers... ]

Insufficient Disk space! WebLogic 10.3.2.0 running on Mac OSX

Note: First read my post about getting JDeveloper installed - you still need to fake out the Oracle installer so it realizes you have a JDK install

Go to Oracle.com and get the Oracle WebLogic Server 11gR1 (10.3.2) - Package Installer - generic

Warning: If you double-click on the jar, you'll get a few screens in and then it will complain (completely incorrectly) about "Insufficient disk space!" regardless of how much free space you have on your machine.

The workaround is to pull up a terminal window, go to the directory holding the wls1032_generic.jar file and execute:

java -Dos.name=unix -XX:MaxPermSize=512m -Xmx1024m -jar wls1032_generic.jar

Seems the installer can't determine disk space correctly without knowing it's an unix system... should install successfully after that.

If you don't increase the perm gen space, you'll hit: "Exception in thread "runScript" java.lang.OutOfMemoryError: PermGen space"

Installing JDeveloper 11 on OSX

Guess what, JDeveloper doesn't install out of box on a Mac... here's how to fix the JDK issue so you can at least get JDeveloper installed:

cd /System/Library/Frameworks/JavaVM.framework/Home
sudo mkdir -p jre/lib
cd jre/lib/
sudo ln -s ../../../Classes/classes.jar rt.jar