I downloaded the CCleaner latest version 325 (using the old Ccleaner "check for update function" at the bottom right corner). The file was downloaded in the firefox download folder.
When I ran the exe file, nothing happened. Thinking the download was corrupted, I deleted it and downloaded exe file again (from piriform site). The same problem persisted. So I deleted the second download also.
Ran the old Ccleaner. Rebooted. Third time download of the latest version from piriform site. Again, the exe file is not opening.
What could be the problem?