Safari 5.1.7 Snow Leopard problem

Hello 🙂

I have a problem with safari, when i want to open some sites it quits unexpectedly, so i deleted it. Then i have downloaded fromm apple instalation for Safari 5.1.7, because i have Mac OS X 10.6.5.
But when i want to install it again there is a problem
" Safari can't be installed on the disk, This update requires Mac OS X version 10.6.8 or later. "

What should i do ?