Installazione e aggiornamento > Installation and Configuration Guide > Using the PTC Solution Installer > Installing Windchill Solutions > Launching the PTC Solution Installer > Installing Critical Patch Sets
  
Installing Critical Patch Sets
A Critical Patch Set is a Windchill update that is released by PTC at regular intervals. During the installation of Windchill you will need to download this patch set into your staging area so that it can be included in the installation process. Critical patch sets can be found on PTC’s support page, located here:
https://www.ptc.com/appserver/cs/software_update/swupdate.jsp