How: Follow the "Upgrading QlikView Server" instructions in the QlikView Server Manual and QlikView Manual
Once both Developer and QlikView Server are upgraded, recreate QVDs [by running the load script to store the QVD files again] and open and save QVW files in Developer or reload them with Publisher/Server as soon as practical.
Customers running V10 SR3 who are not planning to upgrade to V10 SR4 should contact QlikView Support to obtain a patch regarding the security fix.
If you have any problems upgrading your QlikView installation and have a valid maintenance contract, please contact QlikView Support.