I use PNG files a lot so I have updated the application and libraries used
libpng-1.6.39-x86_64
https://www.mediafire.com/file/9plep1r7 ... 4.pet/file
zlib-1.2.13-x86_64 - compression library optimised for Intel CPU's
https://www.mediafire.com/file/9xwjo94d ... 4.pet/file
Pngcrush is a simple terminal application to reduce the size of your PNG files
In terminal just type in
pngcrush <your filename.png>
pngcrush-1.8.13
https://www.mediafire.com/file/y6yy2fr0 ... 3.pet/file