Unfortunately no. It is a new product with lot of extra development and a new lifecycle (updates) and new features (more to come). The ones who jumped on early test versions got Embedded for free if they had Desktop for Linux.
Desktop 3.x owners have been now getting free updates for close to 5 years (Desktop 3.0.0 was released May 31st 2013) and continue to get so for time being (schedule for Desktop 4.x has not been decided yet).
So far, all sales has been new licenses for Desktop 3.x, but this likely cannot go on forever. I should make new products and/or new major releases of Desktop to sustain things.
When you already have either Windows or Mac/Linux license, you can get the other platform covered at 50% discount. Then you have two licenses and all three supported platforms covered.
Web shop offers this bundle when making a purchase, but it is also available at later time by asking me.
Reason for this license split is cost structure split between Windows and other platforms. Windows is just plain different in all possible ways and also needs separate development tools, signing keys and such.
License keys contain email address and name and are thus personal…