The link to the manual is on the page there you downloaded the plugin installer. https://docs.otoy.com/manuals/products/poser/v-3/I cant seem to find the manual either.
You need to install into the folder containing the Poser.exe file that you run when you start Poser.1 Do you normally install to the poser location? { In this case c:poser ? }
You don't have to install Octane Standalone.do I have to install the standalone, first to get that file? To what location?
Paul