Updating bug?!!! Rito please

Okay its been 2 days now since my league started updating... ive tried everything to fix it but no progress.... I even reinstall the game but same damn thing. I mean holy cow.... Update always gets stuck on 271 mb.... and i was at 99 % i left it for 1 day.. i mean really for 1 day.. still the same thing i reinstall it now its still 271 mb 86%. Ive been trying to search for any solution becuase riot doesnt post anything on how to prevent or fix this thing.. Ive tried deleting the S_OK thing or something like that but still doesnt work.... D: sighhhhhh