Honza

Yes, indeed, CCleaner portable 6.06.10144 and older runs normally from a USB flash drive. When a new version of CCleaner comes out, I always download the new portable version to the system C:\ drive and try it from there first, and if everything is fine, save it to a USB flash drive and use CCleaner portable from there normally. Since I couldn't run CCleaner portable from the C:\ drive, I didn't try again from the USB flash drive... Thank you.

Hello, I have the same problem. CCleaner Portable won't start (no CCleaner window appears), I just see in the task manager that there is a task called CCleaner. The same problem is with version 6.04.10044, which was working without problems until three weeks ago. I run CCleaner as administrator. Windows 10 x64 22H2 with all system updates in the month of November. I have ESET Internet Security 16.0.24.0 antivirus. Thank you.