In order to successfully upgrade you must follow the procedure outlined below

1. Make a back-up copy of your existing web.config file (web.backup.resources). We cannot emphasize enough how important it is that you have a backup. If you lose the original value of the MachineKeys, then none of your users will be able to log in.

2. Once you are sure that you have safely backed up your web.config file, rename release.config to web.config.

3. Replace the following keys in your new web.config, with the values in your backup.

a. SiteSqlServer

b. MachineValidationKey

c. MachineDecryptionKey

d. InstallationDate (this may not be present in web.config, so add the key that is in web.backup.resources to web.config)

4. Make any other changes to web.config that you made to support additional providers etc.