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Corel PaintShop Pro X4
<Property name="ALLOW_PRODUCTUPDATES" value="0" persist="1" comment="needs to be saved from admin installs, Script.dll will default it off if we are running an admin setup" />
Download the service packs 1 and 2 (don't know if 2 includes 1). You can either extract each using Uniextract with 'isxunpack extraction' and then apply over the source folder using command: setup.exe /admin (this prompts you for the source directory) or you can run PSPX4_SP1.exe /admin and PSPX4_SP2.exe /admin and it will do the same thing.
There is a registry entry for uninstall of: MsiExec.exe /x{00AE1A2D-7BC2-4359-A0EC-E19F36E391BB} BUT I found this DOESN'T WORK silently even with /QN