Why has my current version of CCleaner for Mac uninstalled itself shortly after I installed the new version?

If you are an existing user of the old version of CCleaner for Mac (version 1.18 and below) and install the new app (version 2.3 and above) your older version will be uninstalled automatically, providing you already have this installed on macOS. This is because both apps cannot provide the best possible user experience while coexisting on the same operating system.

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