I have always installed it right over the old one so it saves my settings and the cookies I have saved. That has ALWAYS worked for me with no problems at all.Others may disagree but I do what works for ME. BTW, I am also waiting until the new version comes out of beta which usually isn't very long.
I see that there is a new version for CCleaner,1.27.242,that is beta. I am going to wait till it is out of beta but have a question. When I go to update do I need to uninstall the old version or install on top of old version? I am new to CCleaner and have had only the 1.26.218 version. Thanks Sly