is it possible to download safari on a windows?

No. Apple dropped support for Safari on Windows years ago.

You might be able to find bootlegged copies of it on the web. I strongly recommend against even downloading them. First, if you manage to find a clean version, which is extremely doubtful, it has not had any security patches in year. Second, the bootlegged copies available on the web usually have every piece of malware available cramped into the install package.

Why would you want to use Safari on Windows anyway?

No really.

Apple stopped making a version of Safari for Windows in 2012.

While you may still be able to find the old installer online somewhere, its so old and outdated, it would be a security hazard, and would be unlikely to open any recent websites correctly.

If you don't like Windows Edge browser, there are other alternatives like Firefox or even Chrome.