How do i remove and install CC but keep current settings?
Don't uninstall, just reinstall CCleaner over the top of the existing one and it will keep all your settings, and your licence key registration if it is Pro.
It's something that I do often.
You can download the latest version installer at any time form here (Tip, use the 'Slim' installer).
https://www.piriform.com/ccleaner/builds
PS. You should also have 'Save all settings to INI file' selected in Options>Advanced, that option saves a 'ccleaner.ini' file in C:/program files/Ccleaner.
You should then make a backup of that file somewhere.
(Then if you ever do lose your settings for some reason you can copy/paste the contents of the backup into a new ini. It can also be used to give the same settings to CCleaner on another machine).