When you install IBM Rational Publishing Engine 1.1.1.2, previous versions of Rational or Telelogic Publishing Engine are automatically upgraded. The upgrade process uninstalls the previous Rational Publishing Engine version and installs the new version. Multiple versions of the product cannot be installed on the same computer. Rational Publishing Engine supports templates for Telelogic Publishing Engine 1.0 and 1.0.1, and Rational Publishing Engine 1.1, 1.1.1, and 1.1.1.1.