Uh, yeah. I was wrong. Apparently the English-only version is only available for Windoze so no luck there.
To see what version of OSX you have, click the Apple icon at the very top left of your screen and select About This Mac. It gives you the version of your OSX as well as your processor and RAM specs (you can get many more if you click More Info of course...)
Run Software Update to check if you have the latest Javas and everything, then open a window in the Finder and go to applications. Click the Utilities Folder and go to Disk Utility. Repair the HD's permissions there and, well, try again with the installing (if it doesn't work once after this don't try again. Just post back)

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-