SFZ+ in Professional

A couple issues.
I can't get any of my soundfonts to load in the "Insert, soft synth...sfz" dialog in Professional. I have some good ones including from Sonic Implants. The "Dialog" comes up, a small interface on the top left, just like it did in Sonar 8.5. I locate what I want in the browser, but it won't load into the File slot. The only one that will load is  the stock "Mini piano" in Professional.
I can load them in Kontakt but the quality doesn't seem as good. I'm on Win7 64
The other thing is, where, if at all do you find the SFZ+ GUI as found in the link below?
 
http://www.cakewalk.com/Products/sfz/
 
Thanks.

Yes, I located the SFZ VSTI in the Sonar Pro plugin browser. I loaded the player. I used the browser in the player to locate my soundfonts (SF2). But they will not load. As I mentioned, there is a Mini piano that comes with Sonar Pro that will load and play. It's just that all my other non Sonar soundfonts will not load into the player at all.
If the SFZ+ player is from 10 years ago, then, obviously, it's not available, though, it's a shame as it gives a lot of functions (ADSR, etc.) that would be useful.
Thanks.

I tried it with several sonic implant and other sf2's and it works for me. I'm on Windows 10 64 bit. Once you load the sf2 click the Program arrow and select one of the variants.
 
The Mini Piano is actually an sfZ file which is a little different.
 
I searched google for sfz+ professional and it looks to be unavailable.