do you mean PXengine358 ?
it's an update to the burning engine of Prassi, which is used by some burning applications.
unless you encounter problematic burnings/bugs with your software, or you have a new drive that isn't recognized by your software, you don't really have to install the update.
but hey, you can install it, and if you don't like it uninstall the burning software and install the original version you have (the only way i can think of 'downgrading' the burning engine if you don't like the update, or if it causes problems you didn't have before).
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
M.C. Escher - Reptilien