Contact software site error while installing KNIME extensions

I have looked in to other tickets which are related with the Contacting software site error and tried to resolve my issue, but it din’t help. i am encountering a contacting software sites problem. sharing the screenshot. request you for quick help.


“No route to host” means that you computer doesn’t know how to reach our servers. This indicates a network problem on your end. Maybe you have to use a proxy?

How to use proxy?
Can you please provid the instructions to do so.

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