How do I get rid of the old Minecraft launcher?

I have a problem where my launcher isn’t the newest one on my PC… I have the old one and it wasn’t really an issue for me until I tried to download a shader pack and couldn’t do it. Does anyone know how to get the new launcher? I’ve been trying to solve this problem for around a year now and I can’t find anyone who has the same issue as me. I can still play 1.16.4, but on the launcher there’s an article about 1.11.2 being the newest update.