Larian Studios Forums Divinity 2 - Ego Draconis (English) Technical problems Bonus Content - Defenders of Aleroth Armour

Try sending a private message to Lynn, or email support@larian.com; if she doesn't have anything to do with the downloadable items, she should know who to forward this to.
The publisher should also be able to help, and should have contact info on the packaging, in the manual, or possibly on the paper with the code for the bonus content.