Tom,
I tried the revised version of 5.24 (8376 kB) that you mentioned earlier and it failed to install on Win 10 Home Insider Preview 1607 build 14955.1000 (yes, I know it's not supported but this is the next Win 10 version in development, fast track release and the info might be useful to you.)
First I got a pop-up saying:
Windows protected your PC
Windows SmartScreen prevented an unrecognised application from starting. Running this application might put your PC at risk.
More info Application: C:\Users\User\Downloads\ccsetup524.exe Publisher: GB, London, London, Piriform Ltd, Piriform Ltd Run anyway Don't run
When I clicked on Run Anyway and gave the OK to the next screen, I got another error:
NSIS Error
Installer integrity check has failed. Common causes include incomplete download and damaged media.Contact the installer's owner to obtain a new copy.
More information at http://nsis.sf.net?NSIS_Error
I tried again with a freshly downloaded version and got the same result.
CCleaner v5.22 still installs OK.
Chris