L2J Server

Hello guys,
I am writing to ask you about server files support. I know, there I can find many versions of Lineage2 servers, it is great, but I am talking about things like "missing quest" or something like that support. Where I could find this support?

I am using latest revision of Interlude server.

For Interlude you will have to find an active fork of the IL branch (like aCis project). L2J does not develop it anymore, only critical bugfixes (which nobody reports anyway).

One big different between Acis and L2j server packs is different library. Many thing in internet are based on L2j, but also there are some places where I can find for Acis. So, you advise me to use Acis?

Yes. Using the stock l2j IL branch would be stupid unless you want to start from it and do some serious development.