Hello! There are very useful tech publications available, especially in your case, the release notes. They contain a section called upgrade paths which you would find useful. Example: this one is for 9.1R11.3 https://www-prev.pulsesecure.net/download/techpubs/current/2309/pulse-connect-secure/pcs/9.1rx/9.1r11/ps-pcs-sa-9.1r11.3-releasenotes.pdf Regarding the pulse desktop client. I've never had any problems between versions where they differ between client and server. And if you have auto upgrade enable, I believe clients would be asked to upgrade once 9.1R11.3 (for example) is installed since it should contain a new PDC version. https://docs.pulsesecure.net/WebHelp/PDC/9.0R1/Content/PDC_AdminGuide_9.0R1/Upgrading_Pulse_Secure_Client_1.htm
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