What I did to update from Magento 2 1.0.0Beta to Magento 2 RC:
- Created backup of database and files - Moved old Magento files to temp directory - Placed Magento 2 RC files in the document root - Added my old files: + app/etc/config.php and app/etc/env.php + extensions and my theme After that I got an error about a resource. I fixed this with this script: https://mage2.pro/t/topic/130
After that Magento worked perfect.
Also make sure that a few things are changed:
- You should add a registration.php file to extensions and themes - The scheme is changed, see Luma theme for an example. The scheme is changed from: ../../../../../../../lib/internal/Magento/Framework/View to: urn:magento:framework:View
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