The XMP Toolkit SDK needs zlib. This release uses zlib Version 1.2.8 To get zlib: 1. Obtain a copy of the zlib source code (not the compiled dll) from http://www.zlib.net/ (download links at the time of writing were at the bottom) 2. Place all top-level .c and .h files of the tar/zip you downloaded directly in .../third-party/zlib