The EPUBs on the server of your deliverer are currupt. Has you download the files a twiche? If this not work should contact the reselller of the file (Google) and ask if can check his links for the eBooks.
I downloaded the ACSM file several times
I read the file, it's not corrupt in the transport sense, but it is possibly using an out of date format... I purchased the same book from Kobo instead, and their ACSM file was nearly twice the size, it contained a few extra fields. Kobo's ACSM file worked.
... hehe, but I still don't like Adobe Digital Editions, as a hoop, for the user to jump through. I don't understand why it's a desktop download, and there's no online offering, I mean, the generated epub is still locked to my authorised devices, unless I'm misunderstanding how everything is related. <- and/or Linux support, too. ADE is the sole item of software I use my Windows XP partition for (I moved to Linux when XP went out of support).
The mobile app still doesn't have any of my titles, and there's no way to add or open titles in it, so that wasn't anything worth keeping.
Has you ask the reseller for the eBook to check the download?
I mentioned this to Google when I requested a refund. I'm not sure they did anything to fix it, they just issued the refund.