Hi all. There are numerous posts regarding this but I thought I'd throw out another. After searching for a couple days on how to read an eBook that I purchased through Kobo that required adobe digital editions, I found this website explaining how to read the URLLink.acsm file on my iPad.
Go to this site and follow the directions. Took all of 5 mins to set things up and now I can read the books on my iPad. It was pretty easy.
Hope this helps.
I would recommend using Bluefire Reader instead of txtr (on both iOS and Android).