This is usually caused by a winapp2 file that is overly large. You say you're testing it without one but i've, in all my years here, never seen a delay in that button not related to winapp2. Do you maybe have a large include or exclude list?
Slow down, we can usually solve this type of problem but you need to explain your situation a little more. What happens when you try to install or uninstall it. Does it give an error? To be sure are you getting it from piriform or ccleaner website (ccleaner.com)? Is ccleaner still running such as monitoring (check the system tray for monitoring)?
Ccleaner cloud allows you to monitor and clean in a business with many computers; it is indeed a separate program from the bundle, which provides the professional versions of the four softwares.
Sounds like there's another cookie you need to move to the cookies to keep side of the cookies option. Try this
1: clean cookies.
2: Immediately go to bank site and only bank site.
3: immediately close chrome then open ccleaner
4: go to the cookies option. See if there's anything in the cookies to delete side. My guess is a flash cookie with an strange name like g.botw.com
There's is a checkbox at the begining of the install process, however you are not the first to not notice it (it may not have shown but i've seen no proof it wasn't there in other cases)
Cookies, cache, history. anything checked off in the browser section in ccleaner. You can turn off autoclean on exit under smart cleaning section I believe.
This warning is usually accompanied by ccleaner still running. Make sure ccleaner is fully exited including smart clean monitoring. Check task manager for ccleaner.exe or ccleaner64.exe. Kill those instances then manully delete the file c:\program files\ccleaner\ccleaner.exe (or the file listed in the error message). Finally click retry(recommencer in the screen shot).
Check to Make sure ccleaner isn't running including monitoring in the system tray. Then manually delete ccleaner64.exe. then press retry on the installer