Guide 1
Watch bundled offers during install
Some CCleaner installers show optional third-party offers. Declining them does not block the main install. Read each screen before you click Next.
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Start the installer you intend to use
Confirm the filename and source on your download page notes before you run it.
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Choose a custom or advanced path when offered
Express setups sometimes hide extra checkboxes. Prefer the option that shows every component.
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Uncheck software you do not want
Browser toolbars, trial AV suites, and helper apps are optional. Leaving them unchecked keeps the install focused on CCleaner.
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Finish and open CCleaner once
Confirm the version number matches what you expected, then move on to a preview clean.