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 Maintenance Release
◦ Service Pack and Standalone Products or Components. This option installs the service pack to your solution and any standalone products or components that are a part of the installation. If there are additional, separate standalone products or components that work with this installation, those must be updated separately using the next option.
◦ Standalone Products or Components Only. If your solution uses standalone products or components on a server separate from your main solution, those must be updated using this option.
• If installing a critical patch set:
◦ Select Install Critical Patch Set
* 
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 Arbortext to Windchill PDMLink.
◦ Select Move up to Windchill PDMLink.
• If adding additional languages.
◦ Select Add a Language.
• If you are installing components that have been updated independently of Windchill, such Creo View:
◦ Select Install Re-released Components
Applying the Maintenance Release
Select Service Pack and Standalone Products or Components.
The installer determines which Windchill products are installed in the selected directory.