Hi,
If you are trying to activate WebRatio Community Platform and you are obtaining a proxy error it means that you are offline or behind a proxy or a firewall that block the connection between you and WebRatio servers.
Please try to use another internet connection.
If you are a teacher you can join to the University program and obtain a specific WebRatio edition dedicated to teachers and students. For more details: https://www.webratio.com/site/content/en/university-program.
Regards,