Missing profile 'Dot gain 20%'

I have a QXP 9.5.3.1 project that is showing as missing the profile 'Dot Gain 20%' for about 60% of the greyscale images in it (about 400 images affected) - this appears to be causing problems with the rendering of the print PDFs. How do I get the profile into Quark please? I see it in Photoshop CS6 used to edit the images. I don't see any Quark warnings at all, only that they are listed as missing when I look in the Profiles section of Usage.

Thanks