Steps to reproduce :-
----------------------

1. Uninstall Java 6u5+ (if present).
2. Download 6u10 online installer from here.
3. Install 6u10 using the 6u10 online installer
4. After installation, run java -version to verify 6u10 is installed
5. Open Command Prompt: Start > Run > type: CMD
6. In the command prompt, type: java -version
7. You should see this version.
    java version "1.6.0_10-ea"
   Java(TM) SE Runtime Environment (build 1.6.0_10-ea-bXXX)
   Java HotSpot(TM) Client VM (build 1.6.0_10-ea-bXXX, mixed mode)
8. Save and run the following script.
9. Run the Java Control Panel Update tab.
10. Click on "Update Now"
11. Click on "Install" on the update dialog shown, then wait for a minute or two.

Java Setup - Welcome dialog comes up then continue to install.
But Java Setup dialog says like "Fail to install" with "Finish" button.

6u10 installer:
 http://java-g11n.sfbay/j2se/6u10/l10n/test/b13wat/jre-6u10-beta-windows-i586-p-iftw.exe

6u11 installer:
 http://javadl.sun.com/webapps/download/GetFile/1.6.0_11-b313/windows-i586/jre-6u11-windows-i586-p-iftw.exe
I made a mistake to describe the steps to reproduce.
In step #8, as the responsible engineer pointed in Evaluation,
I set the registry "UpdateServletURL" to "http://java-g11n.sfbay.sun.com/j2se/6u10/l10n/test/b13wat/map6Ux.xml".
Then, the issue occurred.

Corrected reproducible step as follows:
1. Uninstall Java 6u5+ (if present).
2. Download 6u10 online installer from here.
3. Install 6u10 using the 6u10 online installer
4. After installation, run java -version to verify 6u10 is installed
5. Open Command Prompt: Start > Run > type: CMD
6. In the command prompt, type: java -version
7. You should see this version.
    java version "1.6.0_10-beta"
   Java(TM) SE Runtime Environment (build 1.6.0_10-beta-b13)
   Java HotSpot(TM) Client VM (build 11.0-b11, mixed mode)
8. Set UpdateServletURL registry (string) to http://java-g11n.sfbay.sun.com/j2se/6u10/l10n/test/b13wat/map6Ux.xml
(http://javadl-esd.sun.com/update/1.6.0/1.6.0_11-b313.xml works for 6u10 b13)
9. Run the Java Control Panel Update tab.
10. Click on "Update Now" (ignore the dyamic text on the update dialog, they are just place holder for testing purpose)
11. Click on "Install" on the update dialog shown, then wait for a minute or two.
12. "Java Setup - Close Applications" dialog will be shown (localization will go into b14, so this is still in English), since Java ControlPanel is running. Click "retry" button to close the Java ControlPanel.
The "Java Update - Update Available" dialog comes up according to
the above steps to reproduce, then press "Install" button on the dialog.
And the "Java Setup - Welcome" dialog of the 6u11 installer comes up
after a minute or two, then press "Accept" button on the dialog.
The 6u11 installer should succeed, but the "Java Setup" dialog with
the messages like "Fail to install" comes up and the installer exits
unexpectedly.

The Patch-In-Place testing "Install 6u11 over 6u10" does not work.