Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
I don't see where anything is for sale, not based on the page that link takes you to. NM, found it on sale on one of the Sim Shops. . .but separate purchase for FSX and P3D. . .don't think so.SSW's Thunderstreak is superb and it's 30% off until January 7. It includes the Thunderbird paint. http://www.simskunkworks.com/store/index.php/go-to-our-software-shop
What Thunderjet are you using?

Code is XMAS2017 for 30% off any of their planes.
Their aircraft are awesome. Their website is terrible, and their purchase process is painful. (Separate download for all the paints, but do they put that in the registration email? Nope!) And yeah, separate SKUs not only for FSX and P3D, but for different versions of P3D.
That said, no regrets for my own purchase, as their F-84F is amazing under P3D 4.1.
But as a company, they're not customer-friendly. If you hit Ctrl-E to try to quickstart the engines instead of going through the manual startup process, it plays a brief (unlicensed, I'm sure) music clip of "bad boys" to chide you. Seriously? Condescending to your customers much?
(Despite all this, it's a great plane. But man, they need someone at the company who's customer-focused.)
"Listen, we don't listen." Copy, boxcar out.
Hi,So, if you consider yourselves so much above us, common mortals and customers, why not just give your products to your select friends ? why bother selling when you have so high incomes from your others jobs?
And what about a little politeness and education?
Bye, bye, fare well