Flex SDK Downloads

The following download types for Flex SDK are available:

Free Adobe Flex SDK – An official Adobe product, with released versions found at http://www.adobe.com/go/flex4_sdk. The Adobe Flex SDK contains everything you will need to build and deploy Flex RIAs. It is licensed under the Adobe Flex SDK license because it contains a mixture of open and closed source components (see license info above). The Flex framework source code included in this package is called out explicitly as licensed under the MPL. However, if you want just the open source stuff, you should look at the Open Source Flex SDK.

Open Source Flex SDK – For users who want a package that contains only open source code, we offer the Open Source Flex SDK, which is available from this site. This package is entirely under the MPL, including its binaries. It contains the majority of the Flex SDK (compilers, framework, debugger) but does not include anything that is not open source like the Adobe Flash Player, Adobe AIR, or the advanced font encoding libraries. This SDK is capable of creating Flex applications and can be used in whatever fashion the MPL allows. If you have questions regarding the use of code licensed under the MPL, you should consult with an attorney.

Adobe Add-ons for Open Source Flex SDK – This package contains all of the items that are in the Adobe Flex SDK and not in the Open Source Flex SDK. Downloading this file will allow you to bring the Open Source Flex SDK to parity with the Adobe Flex SDK. This package includes the Adobe Flash Player, Adobe AIR, the advanced font encoding libraries, and the code that allows licensing of things like the Data Visualization components. All of these elements are licensed under the Adobe Flex SDK license.

For more licensing information please check the Legal Stuff page.

Flex 4 System Requirements can be found here.

Flex 4.6.0

Latest milestone:
Flex 4.6.0 Release (4.6.0.23201)

All Flex 4.6 Downloads

Flex 4.5.1

Latest milestone:
Flex 4.5.1 Release (4.5.1.21328)

All Flex 4.5 Downloads

Flex 4

Latest milestone:
Flex 4.1 Update Release (4.1.0.16076)
Free 4 SDK | Open Source Flex 4 SDK | Adobe Add-ons for Open Source Flex 4 SDK

All Flex 4 Downloads

Flex 3

Latest milestone:
3.5 Release (3.5.0.12683)
Free Adobe Flex 3 SDK | Open Source Flex SDK | Adobe Add-ons for Open Source Flex SDK

Please refer to this document if you wish to target the Flash Player 10 for Flex 3.5.

Download the Flex 3.5 data visualization components and automation libraries here.

All Flex 3 Downloads

Flex 3 Compiler Modules

Flex Compiler Modules

The Flex Compiler Modules allow you to rapidly compile, test and deploy an application by simply requesting the main application file from a web browser, similar to working with server-side scripting languages such as ColdFusion, PHP, ASP, or JSP. Note that we recommend using these modules only for development-time and recommend deploying pre-compiled applications in production.

The modules are open source under the MPL license and can be found in SVN here. We won't be providing updates or new builds. However, we've open sourced them in hopes that the community members who are interested in using these compiler modules can use it freely and maintain them.

3.3.0.4852

FlexModule_j2ee.zip
Flex3_webtier_for_coldfusion.zip

3.2.0.3958

FlexModule_j2ee.zip
Flex3_webtier_for_coldfusion.zip

3.1.0.2710

FlexModule_j2ee.zip
Flex3_webtier_for_coldfusion.zip

3.0.0.477

FlexModule_apache.exe
FlexModule_apache.zip
FlexModule_iis.exe
FlexModule_j2ee.zip
FlexModule_manual.zip