I have fixed this in my version by adding:
Html.AppendScriptParts("~/Administration/Scripts/bootstrap-touchspin/jquery.bootstrap-touchspin.min.js");
To:
Administration/Views/Shared/_AdminLayout.cshtml
Before: Bootstrap.js
Html.AppendScriptParts("~/Administration/Scripts/bootstrap-touchspin/jquery.bootstrap-touchspin.min.js");
Administration/Views/Shared/_AdminLayout.cshtml