Hello,
Apologies about the Inconveniences caused!
According to the error you have explained, it appears that the issue is with the Servers or Ports. Also there are currently no reports of the Revolution Slider Visual Editor not getting installed.
Please consider following the Official Documentation for the Revolution Slider Visual Editor: https://revolution.themepunch.com/visual_editor/documentation/ which should help you immensely in setting up the Visual Editor in the correct way.
Hope this Helps!
Let us know if we can help you with anything else or if you find any further issues.