About updating obsolete apps

Hello

I note that Ccleaner does not detect the last available release of many apps installed in my computer.

Why does Ccleaner does not retrieve the last release available for some apps installed ?

Where does Ccleaner find the last available release of a particuliar app ?

Thanks for answer

The Software Updater uses a commercially available service, I’m not sure just which one is currently being used.

As you have noticed not every app that you may have on your machine will be covered by the service.
There are millions (billions) of apps out there, it would be impossible for any such service to cover everything.
As with any such service though the list of what is covered changes and apps get added all the time.
So if you have an app installed that isn’t covered currently then it may get added in future.
For example you will often see a line like this in the CCleaner version notes:

There are also some apps that do not publish their updates openly and those can only be updated from within the app itself.