If you haven’t yet installed the latest version, follow the Downloads link at the top of this page to the PiezoDN section and do so. Once installed, the curves will be in Applications > Piezography > Curves > 3880PiezoDN. (There is an install command for the 3800 in that folder too - that’s the one to use.) The Manual is in the Documentation folder.
The best workflow is to start with the Master curve and make your own linearized curve(s) from that. You’ll need to do your own linearizations anyhow to get the best results.