In today's release, we've updated Flash Player with an important bug fix that was affecting a subset of Flash gaming content. Current Flash Player customers who have selected the "Allow Adobe to install updates (recommended)" update mechanism will be automatically updated to the latest version of Flash Player over the next 24 hours. Please note that this release is not available for the ActiveX Flash Player on Windows 8.1 and Windows 10.
The most recent Flash Player security bulletin can be found here: Security Bulletin (APSB16-08)
New Features for Flash Player 21:
- GPU Memory Information In Context3D
When a Context3D object is created, developers allocate memory for various Stage3D structures which include index buffers, vertex buffers, textures, and programs. Prior to Flash and AIR 21, the only way to verify the memory allocated by the current Context3D is through values displayed by Scout. With the release of Flash Player and AIR 21, a new property of context3D class called "totalGPUMemory" has been introduced which provides the sum of gpu memory used by the index buffers, vertex buffers, textures, and programs created through Context3D.
The total value can be obtained by property "Context3D.totalGPUMemory;".
The value of this property is in bytes and its default value is 0. The information is only provided in direct mode on mobile and in direct and GPU mode on desktop ( On desktop computers, using <renderMode>gpu</renderMode> will fallback to <renderMode>direct</renderMode>). This property can be used when the SWF version is 32 or more .
- Support for Browser Zoom Factor in Firefox
We’ve extended the support for Browser Zoom Feature that proposes scaling of Flash content in the web browser in response to web page zoom factor change. The feature is already available for the ActiveX and PPAPI plugin (link).
It will be available from FP version 21 and is currently available on Firefox Nightly 45.0a1, the official Firefox version supporting the feature has yet to be announced.
- PPAPI vector printing on OSX
As of Flash Player version 19, Vector Printing has only been available for NPAPI while PPAPI supported only bitmap printing. Hence there was an observable difference in printing quality between NPAPI and PPAPI (with NPAPI being better). Now in version 21, we have introduced vector printing for PPAPI for OSX, thus giving a better printing experience from PPAPI supported browsers and applications. The bitmap printing functionality will continue to be supported and used when requested by the content.
- Simplified LSO UI
Flash player provides an per domain/swf option to store locally shared objects on user's system. In the past, users could specify the size up to which a domain or SWF could save their LSOs on their machine. We have now simplified the LSO UI Options. This Simple LSO feature will change the permission scheme and related dialogs to only allow/deny and universally imposes a rational upper limit to the LSO size. End users will no longer be able to specify the size of LSOs (but will be able to approve if LSOs can be created or not).
For complete information please see our release notes.
- Significant performance degradation while reading/writing LSOs 
Current Flash Player users who have enrolled in the "Allow Adobe to install updates (recommended)" update mechanism will be automatically updated to Flash Player 21 over the next 24 hours.
Users who have selected "Notify me to install updates" will receive an update notification dialog within 7 days from today. Please note that Windows users will need to restart their system or log out and in to activate the update notification dialog.
Customers using Google Chrome will receive updates through the Google update mechanisms. Please note that this release is not available for ActiveX Flash Player on Windows 8.1 and Windows 10.
If you would like to install the update immediately, please use one of the links below:
Flash Player 21 Windows for Internet Explorer - ActiveX: 22.214.171.124
Flash Player 21 Windows for Firefox and other Netscape Compatible Browsers - NPAPI: 126.96.36.199
Flash Player 21 Windows for Opera and Chromium Based Browsers - PPAPI: 188.8.131.52
Flash Player 21 for Internet Explorer on Windows 8.1 (64-bit machine): 184.108.40.206
Flash Player 21 for Internet Explorer on Windows 8.1 (32-bit machine): 220.127.116.11
Flash Player 21 Windows for Internet Explorer and Edge on Windows 10 - ActiveX: 18.104.22.168
Flash Player 21 Mac for Safari, Firefox and other Netscape Compatible Browsers - NPAPI: 22.214.171.124
Flash Player 21 Mac for Opera 26 and Chromium Based Browsers - PPAPI: 126.96.36.199
Flash Player 11.2 desktop for Linux (NPAPI): 188.8.131.527
Flash Player 18 Extended Support Release for Windows and Macintosh - NPAPI : 184.108.40.2063
Flash Player 18 Extended Support Release for Windows - ActiveX : 220.127.116.113
Previous versions of Flash Player can be found on the Flash Player Archive page
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