I´m sure if I understood your questions, but I will do my best to answer them:
1- In order to check if your PGP Desktop clients have been updated, go to Universal Console, Consumers tab, Devices. You can see all computers and it´s PGP Desktop version. Please note that sometimes this feature shows fake information, from times to times. We are already fixing this issue.
2- PGP: Message is blocked by policy - server not reachable.
Probably this error came up when sending email from PGP Desktop client computer.
Your PGP is not reaching Universal server: check your network and VPN settings. Try ping server from that computer.Check if your local or network firewall is not blocking PGP port (443)
Keep me updated