If you're on 15, then it might be that the "master" version at that link is 16. If you are on 16, it's most likely because they are having issues with the
http://mirrors.kodi.tv/addons/jarvis/ server. In order to push forward I manually resolved the dependencies by building them from their git versions, and manually installing those zips (not an easy thing to explain how to do if it what I said doesn't already make some sense).
If you are on 15, then you can try the
correct version for your version of Kodi 15 Isengard, however it is missing some of the things the 16 version has at this point.
If you are on 14, then you should maybe look into updating to 15, but if there is a reason that you can't, you can use the
older helix 14 version here.
The list of dependencies in my 16 version are: (the version on the last 3 link to their zips)
service.skin.widgets version="0.0.13"
script.artwork.downloader version="12.0.4"
script.favourites version="2.0.0"
script.tv.show.next.aired version="3.0.0"
service.library.data.provider version="0.0.7"
script.extendedinfo version="2.0.0"
script.skinshortcuts version="0.2.1"
resource.images.studios.white version="0.0.1"
resource.images.weatherfanart.prairie version="0.0.1"
resource.images.weathericons.white version="0.0.1"
They should be pulled automatically at the time of the install once 16 is out of alpha and ready for prime-time.