[RWP] Yamaha S-YXG50 in Reaper?

[indigo]

Somebody here said they are using a Yamaha S-YXG50 as a 16 channel multi 
tamberal synth in Reaper?
I found it on the web, and just tried installing it;  placed in the 
Steinberg VSTPlugins folder where the rest of my plugs are, only Reaper 
refused to run it.
There's no mention in the readme that it can't be used as a VST plug, 
that it must be stand alone.
How are you using yours in Reaper, please?
Also, what happens when the trial period runs out?
Thanks,
Indigo L