Assuming you live in the United States... have you tried checking it out as a Kindle book?
Alternatively, there are several apps which support the Adobe DRM scheme, any of them can read the book as long as you use the same Adobe ID... but getting it into the app will be awkward, I am not sure which ones support downloading the book via the .acsm rights file, if any. You'd have to download the book on your computer and sideload it.
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