I would ask you to reconsider. Maybe look for an open source alternative or just another solution rather than wp plugins, or wp in general. There are already alternative foss programs to wp if you really need a suite for making the website.
The reason I say this is simply security. Let's say you get your hands on a fully malware free version of that plugin today, so far so good. What happens when the plugin needs a security update? Your version is pirated so it obviously won't be updated automatically. Now until you find an updated pirated version your website has a security hole that you can't do anything about unless you disable the plugin. Depending on plugin, now your website is either broken, slow or whatever you get the point


