If you are looking for all the current firmware, drivers, and software (dated November 19th, 2015) for your Surface Book or Surface Pro 4, Microsoft has released a new cumulative download package. Since Microsoft has already released quite a few updates to the Surface Book and Surface Pro 4 since the release of the two devices, you can use this cumulative package to update your devices in the event you do a reinstall of Windows 10. Here’s the official description of the Surface Book cumulative package, which also applies to the Surface Pro 4:
“Cumulative and current firmware and drivers for the Surface Book. This firmware and driver package contains drivers for all of the components in the Surface Book, as well as updates to the system firmware that have been released via Windows Update. These drivers and firmware are compatible with Windows 10, including Enterprise versions. The driver MSI and ZIP files include all of the drivers and firmware needed to deploy custom images of Windows on your Surface devices. Additionally, the WinTab driver is provided for those professionals needing WinTab compatibility with certain Surface Pen enabled applications.”
Download the package for the Surface Book and Surface Pro 4.