I am using Windchill PDMLink Release 11.0 and Datecode with CPS M030-CPS22 unable update.

Hi @明巫_4156481 

The case is usually a different installation user then you try to update the system. 

The user profile contains very important xml file that points to the Windchill installation

If the user profile files are missing then the update option is grey out. 

Content of the file

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE InstallInstances [
 <!ELEMENT InstallInstances (Instance*)>
 <!ELEMENT Instance EMPTY>
 <!ATTLIST Instance id CDATA #REQUIRED>
 <!ATTLIST Instance location CDATA #REQUIRED>
]>

<InstallInstances>
 <!--Registries are located in '[location]\installer\instreg\[id]'-->
 <Instance location="C:\Windchill_11.0\PSI" id="ii-26f8ca2f.16faeed5930.-8000"/>
</InstallInstances>

if the file is missing you can recreate it by yourself. Just point the correct location to a PSI . 

PS> you can find the ID in the PSI folder in a PTCSolnInstaller-installer.properties file. 

WC_PROMPTED.PSI.SELECTED_UPDATE_INSTANCE=ii-26f8ca2f.16faeed5930.-8000

PetrH