No, there’s def a free version,
https://www.ccleaner.com/ccleaner/download
Far left option,
When it comes time to update you may be asked if you want to upgrade, just say no thanks, next screen gives the option to download the free version.
If you go into the Options menu (cog icon on the left side) you should see 2 options, Upgrade to Pro or Start Free Trial, use the Free trial.
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!