Required update can not be installed

I can't get into sl now. I download this required update. Then I go to install and boxes pop up saying unable to access and have the choice to abort or continue. I click continue and receive many more of these notices and I continue. then I try to log into the game and it tells me that it's required. ????????????!!!!!!!!!!

Phew issue resolved. Had to uninstall old version restart computer and install new version.