Im so sick of bugs

When my old windows computer blue screened and was declared dead, i had to switch over to my dad's computer (MacBook Pro from 2013). Ever since i started playing on it my computer stated to crash while playing league. Somedays i wouldn't crash at all, however sometimes i would crash as soon as i got back into my game. I dismissed this and eventually got used to crashing. Sometime around patch 7.10 another error started occurring. Whenever i crashed and re logged back it would say "we have restored this installation to an older version of League of Legends.Now we'll try to patch it up to the latest version." and i would hit ok(it was the only thing i could do) and i would not be able to log back in because apparently my username or password was incorrect when I'm sure it wasn't. Pls fix rito.