This is needed when your PC communicates with the network through a proxy server (company or school network management server). In this case, it is necessary to change the proxy settings (unblocking or other change) in the license activation dialog box.
http://hostedactivation.com/ (It is not http://www.reprisesoftware.com/cgi-bin.)
In addition to the Internet option proxy settings, the settings described in the following .bat file are also required.
Note: Varies depending on the version.
C:\Program Files\Live2D Cubism 4.0\ProxyConfig.bat
C:\Program Files\Live2D Cubism 3.3\ProxyConfig.bat
C:\Program Files\Live2D Cubism 2.1\ProxyConfig.bat
Another possible reason why activation fails is that the Editor is not up-to-date.
If activation does not succeed in the current network environment, it may be possible by temporarily changing to a different method of communication.