CCleaner 5.64.7613
https://www.ccleaner.com/ccleaner/builds
Release Notes 5.64.7613
https://www.ccleaner.com/ccleaner/release-notes
bjm_:
Just an FYI for Win XP and Vista users that there is a download link for the Slim build of CCleaner v5.64 (ccsteup564_xp-vista.exe) in the CCleaner support article Which Versions of CCleaner Work With Windows XP or Vista?. The URL https://download.ccleaner.com/sunset/ccsetup564_xp-vista.exe should also download that same Slim build of v5.64 per Avast employee Sandra CCleaner's 24-Apr-2020 post in the thread CCleaner & Win XP & Win Vista.
The CCleaner v5.64 Portable build for Win XP/Vista (ccsetup564.zip) that can be unzipped and run off a USB thumb drive without installation is currently available at https://download.ccleaner.com/portable/ccsetup564.zip.