We found out that there is an important issue with the Juniper SSL VPN software version 6.2 and higher. It appears that the Juniper Installer Service from previous versions is NOT compatible anymore with newer versions. The result is that when you upgrade the appliance without first upgrading the Juniper Installer Service on all clients, the client applications will not install if users do not have admin rights on their PC.
If you use the Juniper Installer Service make sure that you first upgrade this client on all PC's before upgrading the appliance.
Questions: contact SecureLink, we will be happy to help.