It seems it’s not possible to install updates to plugins bought from the Marketplace that have already been installed. There’s no option to remove the installed plugin or to download and install the update.
For example; I have “Instance Tool” installed, the author has just released an update to fix a bug I reported. The launcher highlighted the plugin to show an update is available but all that happens when I click on the button (that says “Install to Engine”) is a message that says “You cannot install this plugin as it is already installed to all compatible engines”
I’ve tried deleting the plugin from the engine/plugins/marketplace folder and restarting the launcher. Same message.
How do we update plugins we’ve bought?