Place the files from launcher into your game client path (in the same location as StarRail.exe; note that this is not the launcher folder itself, but the two files within it). First, start the server (Castorice.exe), then start launcher.exe as administrator.
把launcher里的文件放到你的游戏客户端路径（与StarRail.exe在同一个位置，注意并不是launcher这个文件夹，而是它里面的两个文件），先启动服务器（Castorice.exe)，再以管理员身份启动launcher.exe。