I talked with Adobe support and they sent me here because they say there is no support available for this, amazing. The error message is: This extension cannot be installed, it requires Fireworks version in range of inclusively between Fireworks 11.0 and 11.1. Now I am no MIT math genius, but I do believe my product falls between those two numbers. Any help is much appreciated as I need this badly. Thanks community.
Well I feel kind of dumb, I just purchased After Effects CS 5.5, and I already owned CS 5 Design Premium, so what happened was my CS 5.5 Extension Manager automaticaly opened when I tried to install the Fireworks CSS3 Mobile Pack, when I was about to do a screen shot, I noticed it. So, I simply opened the CS5 extension manager and it installed fine. Anyway, thanks for ypour help because I never would have noticed that. I am sure I am not the only one out there with two versions of extension manager. I appreciate your help, Dominic!
Please follow the below mentioned steps to install the Fireworks CSS3 Mobile Pack:
1) Manually launch CS5 Extension Manager.
2) Click on Install button in the Top Right side or Select the menu item File > Install Extension.
3) Browse and select the Fireworks CSS3 Mobile Pack extension and click Open.
Hope this solves your problem.