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Signature checking is done during the download of the setup not during the execution. Piriform will release Setup_slim build that excludes the third-party add-ons.

I suspect you're correct. Apparently CCleaner setup is trying to communicate with a server during the update; when setup sees no internet connection it just continues with the installation. I suspect setup was trying to load some (unwanted) third party software that was blocked by my security setting and that caused it to stall when the internet connection was active.

dvdbane, Thanks, turning off the Wifi did it. However, something went a little weird with the adapter; when I went to turn it back on it said it was on, but the tray icon showed it off; the troubleshooter fixed the problem (it was actually off). What is setup trying to do over the internet during the installation that causes it to hang?

Never had to deactivate the AV prior to Setup505?

This is the second time the ccsetup has stalled. The first time I reported this problem with ccsetup505: http://forum.piriform.com/index.php?showtopic=43467 The solution at that time was to use a different build ccsetup505_slim; there does not appear to be an equivalent build for ccsetup506. I've terminated any running versions of CCleaner, but the installation still stalls after "Install Options".

dvdbane - "Slim" worked! Thanks for the reasonable explanation of the problem.

dvdbane: What's the difference between the "Slim" and "Standard" installers?

Why would I, or should I rename the installer file when I never had to do so before? In any case, renaming an application does not affect the way it executes, that is solely determined by its code. As I mentioned the program does run up to the point it requests the installation customizations, then it stalls.

Downloaded the ccsetup505 from Piriform site and ran. After deselecting desktop-shortcut and both Recycle-Bin options, clicked "Next". "Next" widget went dim, window displayed no information and the setup stalled. The only functions working were "Back" and the "X" to terminate the setup. Tried several times, even downloaded another ccsetup505 from download.cnet.com with the same result. Both setup files read as 6.18M.