How do I go about upgrading from CB 1.0 RC1 to RC2 without losing all fields, tabs and values?

Follow these steps:

1. Backup - backup - backup (can't stress this enough) - code and database
2. Write down all your parameter settings in the configuration tabs in your existing CB 1.0 RC1 setup (you can also see most of these in the ue_config.php file located in your administrator/components/com_comprofiler folder). You will need to manually reset all these parameters after upgrading because the process will over-write these settings in favour of the default settings of RC2.
3. If you have added any extra language strings to your RC1 language file(s) you should also take a note of these changes because you will need to add them to the RC2 language file(s).
4. From the Install Components backend select the com_comprofiler radio field and click on the uninstall button. This process will unistall all the RC1 code but it will not touch the various database tables and their content.
5. Install the CB 1.0 RC2 comprofiler package via the Install Components backend. This process will upgrade any database tables needed without compromizing the table contents.
6. Manually change all the parameter settings in the Comprofiler configuration panel to agree with the previous values noted in step 2.
7. Manually change all comprofiler language file(s) with notes kept in step 3.
8. All set!