There is a known issue in the CA Workload Automation Agent 11.4 documentation where plug-in installation fails when the Agent installation directory is specified As ".";
Plug-in Installation Fails When the Agent Installation Directory is Specified As "."
When you use the PluginInstaller to install a plug-in, if the agent installation directory is specified as "." instead of a full path (for example, “./PluginInstaller ./appservices.pak .”), the PluginInstaller fails while backing up the files with a message like:
… is not a file in the agent directory. It cannot be backed up.
To work around this issue, specify the full path of the agent directory, for example:
./PluginInstaller ./appservices.pak /opt/CA/WA_AGENT
If the work around fails with the same message, open a Support Case with CA for a Fix for the pluginInstaller issue.