How to transfer presets from one account to another?

For the holidays, my brother bought me some Adobe Lightroom/Photoshop presets through the Adobe Exchange site (https://exchange.adobe.com/apps/cc/200867/wildlife-presets-for-lightroom-classic).  But, he bought them using his Adobe account (not mine) assuming he'd get a code or something similar I could use to download and install them. But, that's not the way the site works; it simply associates them with the account under which they were purchased. He now has these presets associated with his account and we've been unable to find a way for him to give them to me. How do we get the presets transfered to me?  There doesn't seem to be any way to actually contact the developer (Hexa Style) nor does there seem to be a help page for this issue.