Extract the zip files to your main Blockland folder (C:/Program Files/Blockland by default or C:/Programmer/Blockland for you, itpusher) rather than your Add-Ons folder and delete any folders that look like Add-Ons/Add-Ons or Add-Ons/*Mod Name*/Add-Ons as those mods are probably installed wrong.
Team Deathmatch only checks the Add-Ons/TeamDMv4/Packages folder for game modes to use, and will not look in any other place such as Add-Ons/Add-Ons.