Use this link to get WinRAR for unzipping Advance Steel downloads:
www.rarlab.com/download.htm
To access the latest downloads also please visit http://www.graitec.com/En/download.asp
Some of the joint updates included in SP2 mean that existing joints cannot be updated. A solution is provided in this document.
This document describes the improvements in Service Pack 2 for Advance Steel 8.1.
What is new in Advance Steel 8.1-SP1 - EN UK