I use the portable version of Opera and it's the latest version as you can see in the attached screenshot. Its version is 47.0.2631.55
Just wanted to say that it brings up the "Browser cleaned" notification when closing the portable Opera but it does not actually clean the cache.
Perhaps it’s not designed to clean the cache created by the portable version but if that’s true, it shouldn’t bring up the notification.
47.0.2631.55