Starting from iOS 7.1, Apple requires enterprise apps to be installed through HTTPS only. Install through HTTP will fail on iOS 7.1 or later devices. Therefore, you will have to install and configure the SSL certificate on the Web site that hosts Appeon Workspace, in order for Appeon Workspace to be installed successfully on all iOS devices.
If no SSL certificate is configured on the Web server, then one possible way to install Appeon Workspace on the iOS device is to download Appeon Workspace to the PC first, and then synchronize it from the PC to the iOS device using iTunes.
For more details or other possible solutions, refer to the section called “"Cannot install application because the certificate for *** is not valid" when installing Appeon Workspace on iOS 7.1 or later device” in PowerServer Troubleshooting Guide.
