From a fellow blogger:
CCleaner has had a few issues over the years since Avast acquired the popular system cleaning program from Piriform back in 2017.
CCleaner 5.91 uninstalled most of my software when I removed CCleaner from Programs and Features in control panel. When uninstalling I saw in the progress bar that some MSI, Steam and Origin files were being removed and after it completed I saw that Adobe reader, Afterburner, Aida64, Steam, Origin, Discord, HDsentinel etc were corrupted (not uninstalled completely). I had to spend 2 more hours to reinstall these and scan my PC fully for any malware.