Gimp Normalize function missing Windows 64 bit
https://www.mediafire.com/file/vtcgvzeizsc2687/contrast-normalize.exe/file
Download and move it to C:\Program Files\GIMP 2\lib\gimp\2.0\plug-ins directory.
I dont know if it works with 32 bit systems if it doesnt work download gimp 2.8 and take it from there.