[How to change installation directory?]

If you click on Advanced Options on the install screen, it should let you. Otherwise, you can download the portable build and put it wherever you'd like.

 

The only "advanced" options I see are whether or not to install for all users. I guess I'll go find the portable version.

[How to change installation directory?]

Is there a way to change the installation directory for CCleaner? I can't seem to find the option in the installer.