Can't get Callisto to download through Eclipse 3.2 Update Manager

I keep getting exceptions when attempting to download the JAR files, no matter what mirror site I try. Works fine in Windows XP, but on Ubuntu Linux, the Eclipse Update Manager is useless for attempting to install Callisto from the Callisto Discover Site. I'll need to look into this again some time. I still prefer Jetbrains IntelliJ IDEA over Eclipse. And it works great on Ubuntu.