Guy Parsons
Forum Pro
The NIK Colour Efex 3 is a plugin and all I did when I updated PSP X5 to X6 then later to X7 is to find and copy the plugin across to the appropriate plugin area in the 32 bit version that is installed, it won't work in the 64 bit version....... I hang onto PSP X5 because it has NIK Color Efex 3 bundled in and I like the B&W conversion they have.
Here's where it lives now and works happily in my PSP X7....

I think the PerfectlyClearfor PSP also was copied from X4 or was it X5, anyway both those now are installed in the vanilla version of PSP X7 and not in the Ultimate version. Possibly missing out on some improvements in Perfectly Clear that may have come in later versions, but it works fine for me. Also NIK works well for those B&W images as you say.
Just copy them in, nothing to install, it finds them automatically when you access the plugins in PSP.
Regards...... Guy