Firstly grab the CPL demos here: http://x6.profezgaming.com/
You then need to hex edit the demo to alter the version number which is near the start of the file.
Download a freeware hex editor here, and open the demo file using it.
On the first line or so, on the right hand side, you will see a 1.62, change the 2 to a 4 to make 1.64. Save, watch 🙂