Clicking the "check for upgrade" tells me that v. 5.10.5373 is available and indeed, I can download it.
But nothing happens after that - there is no automatic upgrade, just a message saying it was successfully downloaded. But where? It's nowhere obvious that I can see.
I sort of expected the upgrade to auto-work... but a tthe least, I want to be able to find the file and manually activate it.
At least on mine, it auto updated. be sure to close/fully-exit ccleaner when the update downloads. You can also manually download the portable version and overwrite the files in your ccleaner folder and it will overwrite