"Check for updates" ( lower right of the CC screen) result indicates the wrong version - it suggests a version older than that which is already installed. My computer was recently converted to Win10; could this have something to do with it?
try and manually getting the update from here; https://www.piriform.com/ccleaner/builds
a pre-emptive word of caution, if you skim your eyes across some recent threads you'll see many unhappy users of the latest version, v5.45
there were also reported issues with version prior to that.
so try the latest, or try previous versions available at FileHippo.