Does not require installation; simply unzip the files and run CCleaner64.exe (for 64-bit systems) or CCleaner.exe (for 32-bit systems) from any folder. Professional vs. Free Portable
Recent versions may have third-party analytics enabled by default in the Data\usercfg.ini file; you can manually opt-out in the settings. CCleaner Pro Portable 6.04.10044Microsoft
Before using the Registry Cleaner tool, always allow the program to create a backup of your current registry settings in case you need to undo changes. CCleaner 6.24.11060 Portable - Registry tab hasn't moved Does not require installation; simply unzip the files