Install for Phoshop CS4

Unzip the Work Flow install package.

Double click on the install package and open with your default archiving software. (Album Builder pictured here, but it will say Work Flow)

Extract the files to the a folder.

Once you have extracted the folder, open it. (Album Builder pictured here, but it will say Work Flow)

Find the installer for your version of Photoshop

Find the folder labeled CS4 installer and open it.

Install the .mxp file

Double Click the .mxp extension to open Adobe Extensions Manager. (Album Builder pictured here, but it will say Work Flow)

NOTE: If you have CS5 installed, you'll need to right click and choose "Open With Extension Manager 1.0"

Continue through the prompts

Click "Accept" and extensions manager will install the file into your extensions. If you had a previous version of Album Builder, It will prompt you to overwrite the file.

Verifiy that the installation was successful

Open Photoshop, and navigate to Window>Extensions. Verify that Work Flow is installed.