So i downloaded new version, but before applying it, i did remove old file, removed the config file, then added the new file and loaded but it keeps giving me the old config file!

Type "plugins" in the Rcon console and see what plugin versions you have as this plugin might (for some reason) be loading,

its the latest one 
"Stack Size Controller" (2.0.0) by Canopy Sheep (0.01s) - StackSizeController.cs