How do I get an older version of Safari back?

I have several thoughts to share with you. First, Safari is only installed as part of the computer's operating system, It cannot be individually installed or removed. Second, Safari was not wiped out. You will find its icon in the Applications folder. You can drag it to the Dock to create an Alias to use there. Safari is known for not working with certain web sites. This problem is erratic and does not affect all computers. When this occurs, the easy solution is to use another browser for problem web sites. They seem to always work. If you are unable to access the mail's web site, I would carefully double check what user ID and password you are using. That is usually the problem. Good luck.