Cannot update plugin

I have purchased the All Add-Ons package, but I cannot seem to update the plugin to take advantage of the add-ons that I have purchased. I click Check For Updates, and WordPress tells me there is an update available, but when I try to update, it tells me it's already up-to-date. I am running version 1.8.5 of UpdraftPlus at the moment. What do I need to do in order to get the plugins that I purchased? http://imgur.com/a/PyKpT#1