If you have problems with Installer.app suddenly crashing when you’re trying to install new software, fear not! Here’s the quick and easy way around that. This solution should apply to any firmware version, however I’ve only tried it on 1.1.3.
It has to do with not having enough free space, so first you’ll need to uninstall a few applications, then download BossTool (under the Utilities category).
Next, open BossTool and click “Free Disk Space”.
Now hit the “Relocate Applications” button, you’ll see a pop up asking you to confirm, do so and let it do it’s thing.
After it’s completed head back over to Installer.app and try installing several new applications, it should work just fine now.