If you are using instructions such as "just drop the jar file here", you should probably provide a link to the jar file. or a link to the forum post, or something in the actual readme file on this page

Hey there,

Thanks for your interest in the mod.

Check out the GitHub releases section for downloads:- https://github.com/irtimaled/BoundingBoxOutlineReloaded/releases
Or the forum post for community assistance (and links back to the releases section):- http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/2345401-bounding-box-outline-reloaded-mod-for-minecraft-1

Thanks, Irti