I just D/Ced from a game and cannot log back onto the server

Title...I just d/ced from a game right before a team fight and cannot reconnect to a game because my log in screen there is an authentication error and I think a screen when my game was crashing said my game was set back to a previous installation....how can I d/c mid game and my client get rolled back to a previous client? Current client number on screen 8.17 any help?