Logstash-output-kafka downgrade offline to 4.x.x

We are working with a kafka broker version 0.9, meaning that logstash 5.4 is by default not compatible for the logstash-output-kafka.
1/ Which version do I need ? I saw on rubygems.org that version 4.0.6 is the most recent.
2/ How can I do this offline on a server with no direct internet connection ? What do I need to download ?

Hope you can help.

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