What is a SIT file and how do I install a driver from it?
Files with the .sit extension are compressed "StuffIt" archives or
folders that make downloading a complete set of files more easy. Under Mac OS
9 and older versions of Mac OS X, downloads are often a single .sit file.
Files with .sit extension are normally opened automatically after downloading.
When using a newer version of Mac OS X, you can use the StuffIt
Expander utility, however please keep in mind that we offer drivers and
utilities intended for newer Mac OS X versions as .zip oder .dmg files instead.
After opening the file, you can proceed with the driver installation by following
the instructions in the manual of the product or the readme file for the download.