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ADE is the only way to utilize an ACSM to download an Adobe DRM'd ePub.
ADE 1.7.2, which is what most people run under WINE, no longer works for downloading content from most (all?) sources (the error you posted is one many get with 1.7.2 or 2.0) and 2.0.1 is the oldest version that currently works. There were some threads around here about getting 2.0.1 working in WINE.
iBooks is strictly an iOS, Mac OS, iTunes thing. If the books are DRM free the ePub you get can be read anywhere once it's downloaded, but you need to go through Apple to do that download (and of course many books are DRM'd).
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