Not sure if the APS Installer is working in a multi-server setup. Using it for sites that were on my main server worked, trying to install Wordpress to other servers got stuck with a status of "Installation Task". Accessing ISPConfig directly on the other server and clicking on Wordpress in the "Installed" packages menu gave me a:
The metafile for WordPress couldn't be found".
I looked at "Available Packages" and it was blank, so I did an "Update Packagelist" and they eventually appeared. It no longer gives me an error about the metafile, but the previous tasks still says "Installation Task" and if I try to redo the install it says "The installation path already contains a package installation."