Searching for high version numbers like "v13" for tools that are traditionally on low version numbers (like Netcat) is a common tactic used by malicious sites to distribute malware. Verify the source
Since "Netcat GUI v13" isn't a standard release, here are the most reputable graphical front-ends available, each with distinct features. netcat gui v13 download link
Once you've downloaded Netcat GUI v1.3, follow these steps to install and use the tool: Searching for high version numbers like "v13" for