downloading epubs for easy dictionary lookup on e-reader

So I've become really frustrated over the last couple of days and would really appreciate your help.

I've been using an android e-reader (Meebook) with ttsu browser and the yomitan plugin and it's been great. I got really excited to see Kobo Abe's books had finally been published and I've looked all over BUT no site allows downloading them directly and they make you use their proprietary apps to read them… And when I looked at Kobo I can't even download books I had previously bought and downloaded anymore.

Has anybody else had to deal with this? How are people getting books off these proprietary apps?? If I had to give up on ttsu and yomitan what's the next best way to read with integrated dictionary?

Thanks in advance!