theme i made With kame editor not working on my 3ds??

(idk if this Is the right Place to ask abt this problem i have) So i made this theme With kame editor(an older versione bc the newer ones aren't compatibile With my Mac) i put the zip file on the SD card,and once i download the theme on anemone It dosen't work,basically It shows the basic 3ds theme. Anyone know how to fix this issue? This theme took me hours to make! PS.the theme Is 229 KB