Going from QV version 11.20 SR4 to 12.50 or 12.60 is a very big jump, spanning almost nine years. There have been numerous changes and improvements to QlikView, so be sure that you review all of the Release Notes of the major release versions to get understanding. Also extensive testing of your apps on the new version will be key to ensure that you have a smooth transition. If you need assistance in the upgrade, reach out to your Qlik account manager and they can assist you in engaging with Qlik Consulting Services. Thanks!
Sr. Technical Support Engineer with Qlik Support
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