Piet1507 Posted November 9, 2021 Share Posted November 9, 2021 I just bought the professional version of the app. When I register the App by starting CCleaner Professional I get this error message in the appendix . The Windows 10 firewall settings have been adjusted. The registration data was entered correctly. Windows 10's safe mode didn't help to solved the problem. Link to comment Share on other sites More sharing options...
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