The installation process for the Metasploit web interface is fairly easy.
You can download the Community Edition at https://www.rapid7.com/products/metasploit/download/community/.
To start the installation process, you need to fill in the information required to download Metasploit CE. After that, you will be redirected to the download page, as shown in the following screenshot:
Note: If you don't want to fill in the form, you can open a direct link to download the Metasploit web interface, at https://www.rapid7.com/products/metasploit/download/community/thank-you.
You can also download it from Rapid7's repository on GitHub at https://github.com/rapid7/metasploit-framework/wiki/Downloads-by-Version, but you won't be able to get the activation key.
You can also download it from Rapid7's repository on GitHub at https://github.com/rapid7/metasploit-framework/wiki/Downloads-by-Version, but you won't be able to get the activation key.