"We have restored this installation to an older version of League of Legends."

Seems like every few days (for the last few months) i get a (.x) mb patch.. and it says "We have restored this installation to an older version of League of Legends." Which is confusing to me. The only thing i've found to work is setting my date and time on my pc back and im not going to mess up my stuff for lack of a better alternative.... ( as another non-riot person said to do in order to fix it). Is there an official fix? I've reinstalled since. Kinda getting annoying.