Hi Badgoodguy:
What you are requesting is complicated. I'll explain.
I am a huge fan of "Yukon Gold" as well --- but this is a WMS game on their old platform. You would be extremely lucky to still find this game in the casino ... since this platform is no longer supported.
The "Jade Monkey" game is a few years old, but it is on the current WMS platform. You can find this game at the Niagara Falls casinos, along with Brantford, Ontario charity casino.
However ... you want to play these games from home --- and for free, no less!
Your best best is to check out
www.masque.com -- the home of MASQUE PUBLISHING. They actually convert Ball, IGT and WMS games to home PC versions.
In the case of WMS, there are about 10 titles which have been released (under two different Masque releases). I'm not sure if Yukon Gold is one -- but there are similar great games such as "Roll Credits", "Swinging in the Green", "Off the Charts", "Big Tippers" and "Boom!".
The games play very much like the casino original ones ... and the graphics are identical ports (this is an "official" release).
Hope this helps!
/\/\/\/\ the Shamus /\/\/\/\