Run ILWIS34Ssetup.exe to install the software === Users Guide\ This folder contains the complete ILWIS 3.0 User's Guide (in .pdf format) with a file describing what changed in ILWIS 3.1. ILWIS 3.4 has new functionality, but the same file describes how to use the ILWIS 3.0 User's Guide with ILWIS 3.4.