I have CCleaner pro license valid until 16/09/2022. When trying to update from V5.74 to latest version V5.76 I get the message Ox6: descriptor not valid.
Any idea how to solve this issue ?
Thank you.
That is an unusual one, 0x6 is a Windows 'Invalid Handle' error.
Which Windows version are you using?
I suggest that as a first try you restart your computer, make sure that CCleaner is not running in the background (if it is then 'end task' in Task Manager), and then use the 'Slim' installer (3rd down in this link) to try installing v5.76 again: