Installation and Upgrade > Upgrading to the Latest Version of PTC FlexPLM > Upgrade Steps for PTC FlexPLM > Preparing to Upgrade > Assumptions and Prerequisites for Upgrading
  
Assumptions and Prerequisites for Upgrading
Before proceeding, review the following assumptions and prerequisites.
The FlexPLM source system has PTC FlexPLM with the latest PTC FlexPLM rolling patch and the latest Windchill PDMLink critical patch set (CPS) applied.
For supported upgrade paths, see the latest copy of the Upgrade Matrix. Refer to the Reference Documents page on PTC.com at the following URL: http://www.ptc.com/appserver/cs/doc/refdoc.jsp
For the latest PTC FlexPLM rolling patch, contact PTC Technical Support.
For Windchill PDMLink upgrade-related patches, confirm with PTC Technical Support if any are required.
The target system has Windchill PDMLink 11.0 M030 with PTC FlexPLM 11.0 M030 installed with the latest FlexPLM rolling patch and the latest Windchill PDMLink critical patch set (CPS) applied. For the latest PTC FlexPLM rolling patch, contact PTC Technical Support.