Well, as a test, I went and installed both B&N's latest Desktop reader straight from the website, and the corresponding eReader software from eReader.com, using Wine on my Mac, then copied the program folders over to a USB stick to try out on the library's Windows computers.
Both B&N & eReader apps seemed to coexist okay.
Loaded up fine, opened and read books in pdb & epub format (where supported), both DRM and and non perfectly well, and I could use the two at the same time without any noticeable problems.
So unless some extraneous weird stuff gets put in the system which might screw things up, it should probably be safe enough to upgrade.
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