how do i download and reinsral safari
imac 10.7.5
How to download safari
Mac OS X (10.7.5), updated safari
You have to reinstall the OS to get a new copy of Safari. It is no longer available as a separate download.
Do a backup, preferable 2 separate ones on 2 drives. Boot to the Recovery Volume (command - R on a restart or hold down the option/alt key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. Then re-install the Os.