Modpacks OPSkies2 https://www.curseforge.com/minecraft/modpacks/opskies-2
download from https://github.com/meishiffx/OPSkies2Server/releases
Before running the server，you need run StartServer.cmd on win(you need download forge)
Sorry, there is a client connection server bug that I can't fix。There is a bug in the client's mod。