Flex 4.5 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.

Milestone Builds

You can review the Flex SDK Hero Preview Release Notes here.

Milestone Build Build Date Adobe Flex SDK Open Source Flex SDK Adobe Add-ons
Flex 4.5.1 (Release) 4.5.1.21328A Mon Jun 20, 2011 Download (ZIP, 209MB) Download (ZIP, 131MB) Download (ZIP, 163MB)
Flex 4.5 (Release) 4.5.0.20967A Tue May 3, 2011 Download (ZIP, 229MB) Download (ZIP, 131MB) Download (ZIP, 163MB)