You will find the latest device drivers on the following manufacturer web pages.
If you are having difficulty finding what you are looking for, you can contact your sales representative or service personnel at 905-615-8778.
Here is a Windows Driver – for Models:
3501i/4501i/5501i/6501i/8001i/3051ci/3551ci/4551ci/5551ci/6551ci/7551ci KX XPS Driver 1.3.2929 for Win7, 2008, Win8, 2012 (32 and 64 Bit)
xxx1i_xxx1ci_KXPS
Here is a Mac Driver – For All Models
OSX 10.5, 10.6, 10.7, 10.8, 10.9, 10.10 Installer
Kyocera OS X 10.5+ Web build 2014.10.20(1)