Wrong message when started JDK online installation on the machine where this version of JDK already installed.
The message is
"This installation package could not be opened. Verify that the package exists and that you can access it, or contact the application vendor to verify that this is a valid Windows Installer package"

But if unistall the JDK and start online installation again - all work correct. So the message must be something like "You already have this version of JDK on your machine."

JDK version: 142 u15 b02
bundle: j2sdk-1_4_2_15-windows-i586-p-iftw.exe (downloaded from http://jscpreview.sfbay/j2se/1.4.2/download.html)
tested machine: java2d-01.russia.sun.com
platform: x86 WinXP Pro