Adobe wrote:

Adobe_Flash_120Today, Flash Player 11.3.300.270 for Windows was released to address a crash that was occurring in the Adobe Flash Player Update Service (FlashPlayerUpdateService.exe).  There are no other fixes or changes provided with this build.  This release is available for Windows only, and affects the Active X and Plug-in installers, uninstaller, and msi’s (available on the distribution page.)  No other platforms are affected.

Please be aware that this release is not available from the Product Download Center ( which will continue to provide 11.3.300.268.  We realize that this might cause confusion for some users.  Due to the severity of this issue, we decided to make this build available immediately to help customers affected by this bug.  Due to logistical issues and time constraints, we were unable to update the release on the Product Download Center.  The next release of Flash Player will correct this disparity.  Please note that unless you have been affected by the FlashPlayerUpdateService.exe crash, both 11.3.300.270 and 11.3.300.268 will be functionally identical.

This release will be distributed using the following methods:

For full details on the 11.3 release, please see our release notes.

For those encountering problems with Flash Player, please see this tech note for suggestions and instructions on reporting Flash Player bugs

Report a Flash Player Crash

Firefox users crashing with Flash Player 11.3 who are willing to assist us in determining the cause of the crashes, please download and install the Firefox 15 beta release and submit all crash reports when they occur.  Crash logs created and submitted with Firefox 15 will allow us to gather critical details that are missing from the current crash reports that are being generated with Firefox 13 and 14 and earlier versions.