I know this is an old thread but to add my perspective on this since I'm currently annoyed at this process and how much time I've wasted on it: Uninstalling and Reinstalling the entire Plastic client is an unintuitive, inconvenient, and I'd say clumsy way to add plugins to an existing installation (especially since the Plastic uninstaller/installer is so very sluggish). I've recently switched to the Rider IDE for one of my projects and have been struggling to get the plugin installed.
I'm glad I found this thread explaining how to do this but a downloadable standalone plugin installer or jar file I could install manually would have been really appreciated, or even one of those installers that allow you to modify installed components after the fact. I understand this is extra effort for each update but IMO the convenient solution should be for the end users not the package maintainer.
