How to get older versions of JS/Node.js client libraries?

Hi,

I need to connect to the lightstreamer 5.1 server from javascript/node.js client libraries. Libraries that can be found in the Lightstreamer 5.1.2 download section are 6.1.4 version. When I try to connect to the server I'm getting 'License not valid for this client version'. Could you provide me with correct client version files or advice what can be done to solve this problem?

Thanks

(This was sorted out through direct communication with support@lightstreamer.com)