the .exe that it links too is 5.47.6652 the referrer link to file hippo shows this as the latest update, I cannot download the version from you. and its nagging me that an update is available
Which edition of CCleaner are you using? (e.g. Free, Pro, BE, TE)
Have you tried restarting the software (closing the window and the tray icon first)?
The check for update first happens on launch and then it only checks again infrequently thereafter. It's likely the software is acting on old information.