When running the PluginOnly installer on a workstation a box appears that reads: Need to Install .NET 3.5 SP1. This message also appears when trying to uninstall the old plugin that is currently on the workstation.
When pushing through this box the Plugin does NOT begin to install
To install the Plugin on the workstations this happens with, run the BlackbaudInstaller and select the plugin only option and install.
This overrides this issue and installs the Plugin.