If you have it installed somewhere and know wherre then it might be easiest to go to utilities/options/effects and plugins/photoshop plugins. Or go to the Fx live effects there will be a setup button near the top of the screen click on setups which takes you to the same setup you find under utilities so add foldrer, navigate to where it is installed and click OK. Other than that install it to where Xara is installed, might be C/Program files (x86)/Xara/Xara Pro 10/Xara Photo Editor/PS plug-ins.

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