Cannot install Tropy plugins

I am following the instructions to install plugin but when I click on the install plugin on preferences it opens up to where they are installed but give me no option open the plug files at all

Perhaps your browser automatically unzipped the plugin after downloading it? Tropy looks for the downloaded .zip files to install a plugin. So just download the plugin again, making sure it won’t get unzipped or, alternatively, you can manually install the plugin by moving the unzipped plugin folder into your plugins folder (which you can open via Help -> Show plugins folder).