Greetings,
Correct me if I'm wrong but I think you just replaced the older file. It does not work like that anymore with the new version history system. In order for us to know when a software has been updated, you need to add a new file (the new version) each time you want to update it.
Take a look here: https://toolslib.net/downloads/viewdownload/1-adwcleaner/files/
Regards.