Force update plugin to a required version that is above the current version

Hello all, I have implemented force update using stand alone plugin update checker class but this uses the url that I put in the managed plugin repositories. We have a updatePlugin.xml file. Our main requirement is that if the plugin version is 1.1.1 and the latest version is 1.1.5 and the required version 1.1.3 then the force auto update should install 1.1.3. Currently it is updating to 1.1.5. How to proceed? Please help.