Hello,
I have forward your problem/question to Stardock Support Team for their assistance. Please keep an eye on this thread for any updates. We appreciate your feedback and patience.

Basj,
Stardock Community Assistant

The coupon is only for Stardock software and games. It won't work with master skins or stack with other coupons.

Might I add that not every customer get that mail, and yes, I have checked my junk mail.

I concur with Jan, I've not seen said "mail".   

I concur with both of you.  I have not seen said mail either.  

One reason you might not receive them is if you ever opted out of the mailers. Regardless, here is the survey link so you can take the survey.

https://www.surveymonkey.com/r/DJHD9K7