[crash(I think?)] Client completely disappeared after restarts

This afternoon I was playing a few games, then because I had to do something else, I closed the game and shut off my pc later, I reopened my pc to try and play some more, but the game wouldn't launch at first, it would just show the icon and nothing happened. After a few attempts, I got the client to open, however I then got a message saying that my client had been reverted to a previous patch and had to restart it to reaply the new patches, however this would then reappear every time I restarted it. I tried restarting the client manually, but it wouldn't disappear. Then I tried to restart my pc, but once it had restarted, the shortcut to the launcher couldn't find the league client. So I went into the files only to find that the new client had completely disappeared and only the old client remained(the legacy client)

I have no clue as to what happened, and before trying to completely remove the remaining files I am playing on the pbe client for now. Does anyone have any idea what happened and/or how to resolve this without completely reinstalling the new client? [sg-lux-2]