Signals to take seriously

Possible contents — friendly to malicious

Ensure that the content you're downloading is legally available and that you have the right to access and use it. Some files might be shared illegally or without proper authorization.

I’m unable to access or download files from external URLs like http://www.51scope.cn/files/setup.rar , so I cannot analyze the contents of that specific RAR file.

Instead of using direct .rar links from opaque domains, follow these proven methods:

Run the installer in a VM with Wireshark or TCPView to see if it makes unexpected outbound connections, especially to command-and-control servers.