Download Flex 4

SourceForge Editorial Staff SourceForge Editorial Staff Alex Harui

Flex 4 Downloads

Look here for a description regarding the types of SDKs available.

Look here for an explanation of the different build types found on this page.

Look here for an explanation of how to use a stable or nightly build in Flex Builder.

Latest Milestone Release Builds

Milestone Build Build Date Adobe Flex SDK Open Source Flex SDK Adobe Add-ons
Flex 4.1A Thu June 30, 2010 Download (ZIP, 169MB) Download (ZIP, 65MB) Download (ZIP, 76MB)
Flex 4.0A Sun Mar 21 2010 Download (ZIP, 138MB) Download (ZIP, 98MB) Download (ZIP, 40MB)


Wiki: Build Types
Wiki: Downloads
Wiki: Flex 4
Wiki: Flex SDK
Wiki: Using Gumbo Builds in Flex Builder
Wiki: Versions
Wiki: downloads


  • Robert Hastings

    Robert Hastings - 2012-05-12

    Hi...I'm trying to download the 4.1 Adobe Flex SDK but the link (in fact all the links to all the SDK's) point to the FlexLicense.swf file, which of course leads one back to the downloads page...I'd like to be able to download the 4.1 SDK.


  • Michael

    Michael - 2012-05-13

    You can get the Adobe Flex SDK directly from.

    Edit: I'm removing the link since the SWF files seem to be working now.

    Last edit: Michael 2012-05-15
  • Alex Harui

    Alex Harui - 2012-05-13

    Hopefully fixed (at least temporarily).

  • Robert Hastings

    Robert Hastings - 2012-05-13

    Thanks Michael and Alex for the replies. Unfortunately the link to 4.1 still points to FlexLicense.swf.

  • Alex Harui

    Alex Harui - 2012-05-13

    We are having technical issues with the site. Try clicking on FlexLicense.swf to run it. It should let you choose a download.

  • Robert Hastings

    Robert Hastings - 2012-05-13

    Hi Alex,

    I'm afraid it still doesn't work...after accepting the license agreement I get a paage with two dropdown lists, selecting the download page (for either the other SDKS's or 4.6) I'm taken back to the download page, where clicking the desired SDK link once again brings up the FlexLicense.swf.

    I was able to get the desired SDK from the link provided by Mike.


  • Alex Harui

    Alex Harui - 2012-05-14

    Which browser and os? For me the FlexLicense.SWF shows two dropdowns and a "Select" button. Hitting "Select" should show you a license page and then you should have to check the checkbox in order to enable the "Download" button.

    Our Legal folks want to make sure you understand the licensing issues around the SDK and the FlexLicense.SWF is intended to make sure you take an action to say you've read and understand the license. Going straight to the skips past the licensing UI. I will probably have to delete the link from Mike's post at some point.

  • Visitor

    Visitor - 2012-05-14

    The problem persist with any browser on windows
    by the way an SWF to download a file it's an overkill

  • Alex Harui

    Alex Harui - 2012-05-14

    Some sort of interactive dialog is required in order to make sure you understand that certain binary files in an SDK are not under open source licenses. Open@Adobe does not support interactive content so we are forced to use a SWF hosted externally.

    I fixed a few problems and it works for me on WinXP in FF, Chrome, Win7 in IE, Mac in FF and Safari.


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