For those who cannot access the link you can install the package yourself.
Pkg: https://github.com/mybabysexy/HAGearS3NG/blob/6e1ab2d933fe075ab1e8616f30b5c49ffd098d4d/HASSUI.wgt
Random tutorial from Google (which works, of cource): https://nofreeit.blogspot.com/2016/03/how-to-sideload-wgt-files-on-your.html