You'll need to install Cisco Historical Reporting Client (HRC) on desktop and run that to generate historical reports. You can download the software from UCCX server itself; under Plugins if not mistaken.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...