This issue is usually due to a security setting on your PC or a network security configuration (e.g. a corporation or school that has restrictions in place).
If loading that URL into a web browser on your PC doesn't fix the issue, please first try a different web browser and/or try using the link below instead:
If neither of those URL's work in your web browser, try using a different web browser if possible.
If you are getting an error or a line in the install log about the component Microsoft .NET Framework 4.6.2 not being installed, you should first just try restarting your computer and try again. Microsoft .Net Framework version 4.6.2 is required to install and run iExplorer 4 PC as well as most newer Windows apps, so try downloading and installing it from Microsoft's link below:
Then, once installed, restart your computer and try running or installing iExplorer 4 again.
If none of the above helps you install iExplorer, please submit a support ticket and let us know if you are using a non-personal network or computer, which web browsers you've tried, and attach the install.log that is mentioned in the error to your support case. It's located at the folder path below: