so on thursday november 25th i downloaded fabric for a portal mod and it said "requires fabric api" so i download fabric api and when i opened it it said "Failed To Open" my computer is a macbook air and the version is yosemite

pls help me

Can you provide the crash log please?

its not in minecraft

i can send you a video

oh its to big

click on it to make it big

Fabric API is not an executable jar, its a normal mod that you install into the mods folder.

You can get the installer for fabric loader from: https://fabricmc.net/use/