Different kibana downloadables

We have used Kibana and running fine in MAC.. We also expecting to get license for " Schedule Reports" plugin.
The kibana is in our code repository and we have bit customized it based on our needs.. (Styling CSS changes)

Our some other clients needs this feature but they are deploying in windows and linux servers. This means we need to take Kibana Unix and Windows version and make our customization on top of it.

Please could you explain on why do we need different kibana based on OS? It is nodejs and Javascript with HAPI server. Please let me know if it is possible to have one Kibana for all OS? What are the changes required?

AFAIK the reason is only that Kibana ships with the NodeJS runtime, which obviously is OS and architecture specific.