Do you still have the backup file? If so, do the following:
1. Extract the backup file locally, using eXtract Wizard.
2. Download the installation ZIP archive of the latest developer's release.
3. Find the backend/installers/abi.jpa file in the archive and copy it on your desktop.
4. Extract the abi.jpa file with eXtract Wizard.
5. Use the extracted files to overwrite all existing files from the extracted backup archive. That means, drag the installation directory extracted from abi.jpa in the folder where you extracted the backup archive and accept all overwrites. This will have the effect of having the new version of the ABI installer with your existing database dump inside the installation directory.
6. Upload ONLY the installation directory to your site.
7. Run the restoration script, by visiting http://www.yoursite.com/installation/index.php
8. Go through all installation steps like you were restoring a site. When done, remove the installation directory.
9. Now, go to your site's backend, Components -> Community Builder -> Tools and click on the Check CB database link. It should find only one error. Click to fix it and you're done without data loss.
I hope that helps :)
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!