The reason I did this is because AEC is now a commercial package and it is somewhat limited in terms of good customer service. It only really manages the payment side and the complicated tasks of invoicing, but Community Builder provides more options for your website members. If Joomlapolis ever complete the CB Subscription component then there is no need for AEC anymore.
For this we're basically going to follow the AEC installation instructions backwards.
1. Go to your admin panel (back-end)
2. Extensions > Plugin Manager
3. Go to the bottom and change the display # dropdown to ALL
4. Disable Authentication - AEC Access
5. Enable Authentication - Joomla
6. Re-enable any other authentication plugin you used to use.
7. Disable System - AEC Routing
8. Disable System - AEC ErrorHandling
9. Extensions > Install/Uninstall > Plugins
10. Tick Authentication - AEC Access
11. Tick System - AEC ErrorHandling
12. Tick System - AEC Routing
13. Tick User - AEC User
14. Click the Uninstall icon at the top of the page
15. Click on the Modules link (to uninstall modules)
16. Tick mod_acctexp (if you installed this) and Uninstall.
17. Click on the Components link (to uninstall components)
18. Select AcctExp and click on the Uninstall icon.
Now install Community Builder
1. Download the latest version from Joomlapolis.com
2. Unzip to a folder
3. Login to your admin panel
4. Go to Extensions > Install/Uninstall
5. Install com_comprofiler.zip (remember to wait till it confirms it says "Installation finished")
6. Go back to Extensions > Install/Uninstall
7. Install mod_cblogin.zip
8. Install mod_comprofilerModerator.zip
9. Install mod_comprofilerOnline.zip
10. Go to Components > Community Builder
11. Click on the Tools link and click on Synchronize Users
12. Go to Extensions > Module Manager
13. Tick next to CB Login, CB Workflows, CB Online and click Enable
14. Return to Components > Community Builder > Configuration
15. Click on the 'Registration' tab
16. Change Allow User Registration to Yes, ...
17. Make your custom configuration and Save the configuration file.
18. Go to Site > Global Configuration > System
19. Select No next to Allow User Registration and click Save