The filename in the URL is setup.rar (or potentially setup.exe if the extension is masked). Legitimate software installers are typically packaged as .exe or .msi files. While .rar is a valid archive format, distributing software as a RAR file requires the user to extract it manually.
Once downloaded, right-click the setup.rar file and scan it with an updated antivirus (like Microsoft Defender) before opening it. http www51scopecn files setuprar top
Once you have the software installed, you can right-click on the ".rar" file and select the extraction option. This might be labeled differently depending on the software you're using (e.g., "Extract Here" in 7-Zip). The filename in the URL is setup