Some users can access "Older Apps" (such as Flash Builder 4.7) by enabling "Show Older Apps" in the Creative Cloud Desktop App settings.
If you previously purchased a license, you may still be able to find the installer in your Adobe Account Order History .
For those with lost installers, community-maintained sites like the Internet Archive host preserved copies of the software and its educational materials. Key Features of Flash Builder 4
Flash Builder 4 introduced several transformative tools for the Flex ecosystem that differentiated it from its predecessor, Flex Builder 3. Where to download install files for Flash Builder 4.0.1?
Adobe Flash Builder 4 Download: A Complete Guide to Legacy RIA Development
As of , Adobe has officially removed Flash Builder 4 download pages from its primary website.