After a clean Windows installation, you frequently lack network drivers. Without internet, you cannot download a modern driver tool. The of 14.8 R418 solves this: burn it to a USB or DVD, run it on the offline PC, and it will install your LAN/Wi-Fi driver in two clicks.

Run devmgmt.msc (Device Manager). Right-click the problematic device → Properties → Details tab → Hardware IDs. Copy the VID/PID and search manually. DriverPack 14.8 might lack that specific driver.