Mac Download

I am trying to download fortnite from epic games. I downloaded 10.10 because this game only has 10.5.5 which my computer/Mac can not have for about 1 million reasons. I do not know why this game is biased and only lets pc players have the fun. I was this close but I found out after three hours that this game can not download. PLEASE! I AM BEGGING YOU! I give no ■■■■■ no one will see this but do everyone with a mac a favor and let us use mac older and better updates. PLEASE.