We have updated the Free and Pro Trial installers today to address an installer performance issue that could have resulted in delayed launching of the installer in some cases.  If you already have CCleaner installed you do not need to perform an update or take any other action. The CCleaner 32-bit and 64-bit executables have not changed, therefore the CCleaner version number is the same ( The CCUpdate.exe is rebuilt from scratch as part of the CC installer build