Minecraft Optifine installation not possible?

Hi. I was just about to get Optifine for Minecraft 1.15, but when I try to install it, it just opens up a type of modloader that has nothing to do with Optifine. Does anyone of you know how to fix this problem?

1.15 has only been out since 5:00 p.m. Give Optifine some time.

Well, but if you already publish the 1.15 version for Optifine… I've had this problem several times with Optifine.

It has not been released yet