The ADE version is almost certainly a Secure PDF, which will be displayed like any PDF (full page, or reflowed on a page by page basis).
Another popular option, if you have a Windows PC and if you are comfortable removing DRM, is to buy the MS Reader version and strip the DRM using "ConvertLIT GUI". Calibre can then convert the DRM-free LIT to ePub or LRF. It is also possible to strip the DRM from MOBI and eReader ebooks.
In the case of this ebook, I suggest waiting to see if the PDF version is "good enough" (most are, depending on how tolerant you are of a half empty screen every 2-3 page turns). You probably can't get a refund, but LIT may be an option for your next ebook.
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