When I try to install the Paintshop Pro X4 Ultimate Bonus Pack and try to install Nik Color Efex Pro 3.0, the selection is grayed out and I cannot check or un-check the option.
This is normal. The Nik Color Efex Pro 3.0 will be installed by default. Simply choose whether or not you want to include the Picture Tube Collection, and click on Install Now.
Keywords: PSPX4 Ultimate, bonus pack, nik efex 3.0