Start Flex Builder; then select Help > Software Updates > Find and Install.
Select the Search For New Features To Install option and click Next.
Click the New Archived Site button.
Select the CF_FB_Extensions.zip file, and click Open. The default location for this file in Windows is C:\WINDOWS\Downloaded Installations\Adobe Flex Builder 2\ColdFusion Extensions for Flex Builder\CF_FB_Extensions.zip.
The location of this file is where you directed the install files to be unzipped when first starting the installation of Flex Builder.
When the Edit Local Site dialog box appears, click OK.
Ensure that the CF_FB_Extensions.zip is checked and click Finish.
In the Updates window, select the check box next to CF_FB_Extensions.zip, and click Next.
Select the I Accept The Terms In The License Agreement option and click Next.
Click Install All.
When the installation is complete, click Yes to restart Flex Builder.