Make sure that Photoshop is not running.
Download and install the package to:
/Applications/GSWPluginInstaller (The link is at the bottom of the page..)
Then click on activateGSWizard.app
The following screen should appear:
You do not need to fill out any information, just click the “Install Photoshop Plugin Demo” and the plugin will install.
Exit the program and then click “GreenScreenWizardPluginHelp/PluginHelp.htm” to read the help file.
Then start Photoshop and try the plugin. The lines in the plugin are for the demo. When you buy the software they are removed.