Hi Kiwi:
Avast / Piriform will not be offering a portable build for CCleaner v7.00 and higher. The CCleaner Portable v6.39 file (ccsetup639.zip) available <here> on the official downloads page will be the final portable build released for CCleaner. See employee MrA’s 08-Oct-2025 post in my topic Builds Download Page Offering Outdated CCleaner Portable v6.39 for further details.
If you want to continue to use CCleaner Portable v6.39 make sure that you remove all traces of CCleaner v7.x first ***, and then disable automatic updating at Options | Updates | Control Product Updates for CCleaner immediately after you have unzipped ccsetup639.zip and launched CCleaner Portable v6.39 for the first time (see image below). If you see a button on your CCleaner Portable v6.39 interface or on a pop-up ad that says something like “Try our new CCleaner” DO NOT click the button to accept the upgrade, since this will install the full “standard” edition of CCleaner v7.x in C:\Program Files.
*** NOTE: I’d suggest you use Revo Uninstaller Free in Aggressive Mode to uninstall CCleaner v7.x, which should remove additional files and registry entries that are often left behind from a “normal” uninstall from Control Panel | Programs | Programs and Features.
Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.6691 * Firefox v146.0.1 * Microsoft Defender v4.18.25110.6-1.1.25110.1 * Malwarebytes Premium v5.4.5.226-146.0.5441 * Macrium Reflect Free v8.0.7783 * CCleaner Free Portable v6.39.11548 * HDCleaner Portable 64-Bit v2.095 * Revo Uninstaller Free Portable v2.6.5