Installation and Upgrade > Installation and Configuration Guide - Update Existing Installation > Updating an Existing Installation > Selecting Update Options
  
Selecting Update Options
When updating an installation you may be provided with the following options, depending on what you have previously installed:
If installing a critical patch set:
Select Install Critical Patch Set
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Critical patch sets must be downloaded from PTC’s Technical Support site and extracted to your staging directory before entering the Define Settings phase of the installation process. Critical patch sets can be downloaded from https://www.ptc.com/appserver/cs/software_update/swupdate.jsp.
If installing optional components to extend the functionality of your solution:
Select Install Optional Components.
If you are moving from PDMEssentials, Arbortext or Pro/INTRALINK, to Windchill PDMLink.
Select Move up to PTC Windchill PDMLink.
If adding additional languages.
Select Add a Language.
If you are installing components that have been updated independently of Windchill, such CreoView:
Select Install Re-released Components