Releases around libpng libpng16/older-releases/1.6.27beta/libpng-1.6.27beta01-README.txt on SourceForge
Maybe you can find something interesting in this list
libpng
on SourceForge
libpng16/older-releases/1.6.27beta/libpng-1.6.27beta01-README.txt
libpng16/older-releases/1.6.27beta/libpng-1.6.27beta01-LICENSE.txt