[CLIENT] (Alpha) Cannot switch to legacy client

Unsure of where to put this, so I'll just put it here and if it gets deleted, so be it.

Anyways, there's a button that says "Switch to legacy client" and I click it, it shows the League symbol that shows up on the original client, then... Nothing

There are 4 processes of League going on in my task manager, and when I had this problem before I switched to alpha, there were normally 5 I think.

I wanna play the All for One gamemode, but I can't because the Alpha client doesn't have that functionality.