You can install the latest drivers from linuxtv.org. The steps to do it are here but are a bit general, so can be hard to understand.http://www.linuxtv.org/wiki/index.php/How_to_build_from_Mercurial
First from a terminal session (from KDE desktop, System-Konsole)
sudo apt-get install mercurial
Then follow the Retrieve and Build steps. I think you can ignore the rest of the page. You *might* have to retrieve the "kernel-headers" package, can't remember if it is installed by default with LMCE.
sudo apt-get install kernel-headers
If your kernel has the module you need built into it, there is an additional step to "blacklist" the existing module to let the new one get loaded.
Disable the kernel module DISABLED_MODULES line to read:
DISABLED_MODULES="cx88-dvb other_driver1_ other_driver2"
Other_driver1 and other_driver2 would be other module names that relate to your DVB-S card.
Also worth looking in the mythtv.org wiki http://www.mythtv.org/wiki/index.php/Hauppauge_WinTV_Nova-S_Plus_PCI
and the linuxtv.org DVB wiki http://www.linuxtv.org/wiki/index.php/DVB-S_Devices