Yes, it's the payware version.
It's capable of doing far more stuff, than I am capable of using it.
But it does let you do a great many things very easily
, and more than a few things that would be impossible to do without it.
Even something so simple as sending two commands with one button or key.
It's kind of hard to describe the program. Until you start playing around with it, you probably won't understand how useful it can be.
The more equipment you have the more that you'll need it.
If you mainly use the keyboard, you'll probably be fine without it.
The first use that I made of it was to make my Saitek Radio Panel work the GPS onscreen in FSX.You would not believe how incredibly easy it was to do that.
The latest version for FS9 is FSUIPC 3.999z9
The latest version for FSX is FSUIPC4 4.927a