User Profile

I am unable to find MacOS 11.5.1 Beta updates after installing the profile.During installation, I get the warning that The package was signed with a certificate that has expired. If you acquired this package recently, it may not be authentic. Do you want to continue with the installation anyway? I continued and it seemed to install correctly - however Software Update has not found the beta 3 update for the past 2 days. I have wiped and reinstalled the Macbook Air three times. I also get the same warning when installing - SF Pro Fonts- SF Symbols AppI am a member of an active Apple Developer account.