install renumber-button via URL?

[zbeekman]

Is it possible to install the renumber-button extension via the URL like the ToC and gist examples in the README? When I try I get:

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   178  100   178    0     0    563      0 --:--:-- --:--:-- --:--:--   568
100  1114    0  1114    0     0   2392      0 --:--:-- --:--:-- --:--:--  2392
Please specify one nbextension/package at a time