I had that same problem/error with four titles on Google Play, and for months, probably years, I didn't do anything other than check them from time-to-time. Three of the four were just inexpensive repurchases that I still had the DTB if I really really wanted to re-read; the fourth I read using Google Play Books on my phone. I actually prefer reading on my phone, so it was no big issue for me to do this.
Finally, though, we bought a new computer (Win 10 Home) and although I reinstalled the same version of ADE (2.0.x), rather than a newer version, the four books now download just fine.
No idea why, but I'm not complaining...
So maybe try on a totally different computer, if you have access to one.
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