When updating a workstation, users receive an 'Error writing to file: C:\Config.Msi\xxxxxx.rbf. Verify that you have access to that directory.' error message.
Try each of the following steps in order until the issue is resolved:
1. Ensure you are logged in using an account with local administrator rights. 2. Temporarily disable Anti-Virus software. 3. Grant the SYSTEM account Full Control of the folder specified in error message. 4. Log in as a different user with local administrator rights.