Upgrade Windows 8 from Beta to RC Build 8306

Yesterday WinUnleaked broke the news that the Windows 8 RC candidate will be released in late May and early June, and the actual build version of the RC candidate is still "Post-BETA". So, since it is the "Beta" version, can the existing Windows 8 Beta (that is, the consumer preview) Build 8250 be upgraded to the Windows 8 RC candidate Build 8306? Look at the results:

The upgrade process is normal, the account name is saved, and the files are saved, but all built-in applications in Windows 8 Beta are corrupted.

These applications look normal on the Start screen, but crash when you try to open them. Another small change is that you can see from the above image that the "Video" and "Music" applications were renamed Microsoft Zune Video and Microsoft Zune Music in Build 8306.