The kindlefix script is for MOBI ebooks from OverDrive. Most lending library ebooks are now in ePub, rather than MOBI, format. It is not possible to read an OverDrive ePub on a Kindle without removing its DRM (encryption).
For ePubs, you need Calibre to convert from ePub to MOBI and a tools_v2.1 Calibre plug-in to strip the Adobe DRM from the ePub. See Apprentice Alf's Blog for an overview of DRM issues.
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