ekanya,
You cannot locate the WNH Col Differences Filter plugin, because there is no such plugin and no such filter. But WNH Unique Column Differences is a Joe’s plugin and a link to download this plugin is available somewhere in the Joe’s posts.
The concept of WNH Differences is basic for EL and there are many plugins and filters, which deal with the WNH Differences in columns, and their names could be confusing. Sum filters are part of EL build, but some are available as plugins only.
Stan's plugins should be downloaded, saved, and installed with the extension .plugin. You have to add the extension .plugin, otherwise it will be downloaded as .zip file and your installation will be unsuccessful.
Joe's plugins should be downloaded, saved and installed as .jar file. You have to add .jar extension.
Download plugin file to temporary folder (outside of EL) and save.
To locate the plugin, which is in the temporary folder, and install it use the pathway: Lottery --> Preferences --> Plugins --> Install manually.
Do not worry too much about official installation instruction; use your computer skills instead.
After completing the installation make sure that the plugin is on the list of plugins installed and the checkbox next to it is checked. (Again: Lottery --> Preferences --> Plugins). Sometimes the plugin is on the list but the check box is empty and you need to check it and restart EL.
But the build 1034, which you use, has only basic functionality, and I am not sure whether it accepts all plugins.
I use the build 1035 [Jackpot] .
Good luck