Where can I download Safari for Windows?
Safari on Windows is no longer supported by Apple.

Safari 5 (from 2010) is available via Apple's KB. The original page no longer exists, but the EXE is still hosted. 

According to 9to5mac, it seems that have Apple decided to stop producing Safari for Windows, so Safari 5 is all that's likely to be available moving forward.

Update: As mentioned at Geek Dashboard, better use a cross-browser testing tool if you just want to test your project UI. With this, you will have the latest version of Safari running right in your favorite browser.