The file title says unzip to Blockland folder. That's literally all you need to do.
There is two folders in the zip file, one named Add-ons, and one named shaders. The shaders folder contains items that go into the shaders directory, and the add-ons folder contains an add-on. If you were to place the zip file into the Blockland directory and then do a "Extract to here", all the files will automatically be in the correct places.