I just bought the CCleaner Professional Plus package, and got the setup.exe. When I run the installer, it goes through its normal steps, but when it says it's done installing (which takes about 2 seconds, and I literally mean 2 seconds) and to click "finish", nothing has been installed.
having recently received the Plus package as well, it also didn't work for me, same thing, couple of seconds to 'install' but nothing installed.
I simply downloaded each of the Pro products individually and installed each separately, using the same license key for all.
slight pain but got there in the end.
get them all from here; https://www.piriform.com/download