It's a good thing you don't need to install it at all then as the classic styled portable version exists.
I still use it and it works fine, BUT it
must be tweaked to custom criteria because out of the box simply running it will mess stuff up so it's not for newbies. I only use it to remove orphan entries from old desktop shortcuts/start menu references or obsolete keys etc and also to quickly lean up certain Windows/App caches
.
So yeah ccleaner (portable) still does what it did best years ago, but you need to be aware of it from back then else out of the box it's not advised. The stuff I use it for are not touched by Windows built in cleaners (which I also use for the other stuff) with the remainder of the maintenance tasks done manually (the folders and tools on the left) throughout the month to maintain a clean and organised OS.