No you don't need to and DO NOT UNZIP any of Marcus plugins or any other plugin no matter where you get it from. To upload one of Marcus plugins is no different from any other plugin. Just go into your dashboard>plugins>Add New. From their you located the plugin on your computer and when it is found. just click install. - just like any other plugin that is on your computer. - not to mention, it is basically the same steps when getting a plugin from WordPress.org.
Please note that if you are running an older Operating System like windows 7, you may experience error problems. Also note that as wordpress updates to newer versions, older plugins may stop working or will not install into wordpress. If the owner of the plugin doesn't keep his plugin up to date with respect to newer wordpress versions, that plugin might stop working all together. - In that case you are just out of luck! - sorry!