I am trying to install nRF Connect SDK v1.6.0. For some reason the download speed is extremely slow, and even fails without the ability to resume automatically. On two occasions Toolchain Manager v0.9.3 claimed it had successfully installed the SDK but I couldn't locate boards, projects, or even zephyr root folder in SEGGER, as if the download was incomplete. Is there a way I can manually download the necessary files and feed them to the Toolchain?