Just want to say that I got the 50% discount to work just fine, after some helpful direction from the ED Team.
If you are new to the game and want to take advantage of this great discount, just make sure you aren't making this purchase during a main sale event (like the Fall or Summer Sale). Then, follow the directions on the DCS technical support area: https://www.digitalcombatsimulator.com/en/support/faq/Discount/
Hope this helps anyone! Clear skies and easy stomachs!