On several occasiona I have tried to update and install the most current version and I consistently hang at this point requiring CTRL-ALT-Del to unstick it:
Output folder: C:\Program Files\CCleaner
Extract: ccleaner.exe
Extract: winapp.ini
Extract: ccleaner.dll
Extract: winsys.ini
Extract: winreg.ini
Extract: history.txt
Extract: CCSubTimer.dll
Extract: CCTreeView.ocx
Extract: CCListView.ocx
Extract: CCListBar.ocx
Extract: CCTab.ocx
Extract: CCHelper.ocx
Extract: CCSystem.dll
Extract: lang-1033.dll
Registering: C:\Program Files\CCleaner\CCSubtimer.dll
Registering: C:\Program Files\CCleaner\CCTreeView.ocx
Registering: C:\Program Files\CCleaner\CCListView.ocx
Registering: C:\Program Files\CCleaner\CCListBar.ocx
Registering: C:\Program Files\CCleaner\CCTab.ocx
Registering: C:\Program Files\CCleaner\CCHelper.ocx
Registering: C:\Program Files\CCleaner\CCSystem.dll
Create shortcut: C:\Documents and Settings\HP_Administrator\Desktop\CCleaner.lnk
Create folder: C:\Documents and Settings\HP_Administrator\Start Menu\Programs\CCleaner
Create shortcut: C:\Documents and Settings\HP_Administrator\Start Menu\Programs\CCleaner\CCleaner.lnk
Create shortcut: C:\Documents and Settings\HP_Administrator\Start Menu\Programs\CCleaner\Uninstall CCleaner.lnk
Output folder: C:\DOCUME~1\HP_ADM~1\LOCALS~1\Temp
Extract: ytb2.exe
Execute: "C:\DOCUME~1\HP_ADM~1\LOCALS~1\Temp\ytb2.exe" /s