To download the launcher for Elite Dangerous please click the following link or visit the My Downloadable Products page of the Frontier Store.
https://hosting.zaonce.net/elite/Client-Installer.exe
(If this link does not work for you, please cut and past the link into the address bar of a new window and it should start the download).
Paint Jobs for Elite Dangerous are automatically available in-game shortly after purchase and do not need to be downloaded.