Installing Quartz Composer Plugins could be confusing since there are multiple type of plugins: official API plugins should be installed into Plug-Ins, while Skanky SDK plugins - like Kineme plugins - should be installed into Patches directory.
Drop in one or multiple Quartz Composer Plugins to the Install tab of the Plugin Manager, the tool will auto-detect where the plugins should be placed, and will copy there for you!
The tool can detect if a plugin has been installed to the wrong directory, and it can also detect whenever multiple instances have been installed of the same plugin, which could be a root of many problems with plugins.
The Manage tab gives you a list of all the Quartz Composer Plugins installed, and allows you to fix all the issues with a single click.