As for other library dependencies, source and binaries are no longer included but must be installed separately.
The file layout has changed in one detail: zlib headers are now under XPlatform/zlib rather than XPlatform/zlib/inc. Rather than working around that by moving the headers after the build, I've updated those projects relying on that that I could find, hope it doesn't upset any that are not here.
Installation instructions:
1. Download zlib126.zip (or a newer version) from http://www.zlib.net/ , extract the zlib-1.2.6 folder it contains and move/rename it to MOULOpenSourceClientPlugin/StaticSDKs/XPlatform/zlib .
2. Download lpng1510.zip (or a newer version) from http://libpng.org/pub/png/libpng.html , extract the lpng1510 folder it contains and move/rename it to MOULOpenSourceClientPlugin/StaticSDKs/XPlatform/png .
3. Open png/projects/visualc71/libpng.sln in Visual Studio 2003.
4. Select "LIB Debug" from the Solution Configurations popup menu in the toolbar, then Build > Build Solution.
5. Select the "LIB Release" configuration and build the solution.
6. Make a new folder png/lib and move png/projects/visualc71/Win32_LIB_Debug/libpngd.lib as well as png/projects/visualc71/Win32_LIB_Release/libpng.lib into it.
7. Make a new folder zlib/lib and move png/projects/visualc71/Win32_LIB_Debug/ZLib/zlibd.lib as well as png/projects/visualc71/Win32_LIB_Release/ZLib/zlib.lib into it.