Rigol has implemented some changes on their site to force one to his regional Rigol page. In the US, we can no longer reach the international, EU, or China site, they all redirect us back to the rigolna site.
I know the promo is available in the US, but not sure if that's true in Turkey (I presume that would go to the EU site). If it is available in Turkey, I agree it is better to get the promo so you will get the legit free licenses in perpetuity without fear that the hack will not work with some future firmware version.