How to convert R15 animations to R6?

I've been trying to recreate some R15 animations that I done for the last couple months and for some reason the game doesn't like playing with R15 Animations and makes the game break.

I don't want to recreate them all because it takes alot of time (mainly because of school and stuff), and I don't like giving robux to animators to recreate them(mainly because i dont have and some animators are not trust-worthy enough).

Can you guys help me here?

If you are trying to say that you want the game to be R6, go to this path. Roblox Studio > Home > Game Settings > Avatar > Avatar Settings