I have made the changes and it is bit different from the older post
Made the changes on the listed files on NopCommerce3.5
copy the last image script section associated with slider image and copy & paste and then change the image number
sample: copy script section of Picture5Id, Text5, Link5, Picture5, Picture5Url and paste it just next to the last image section follow the pattern and increment picture number to Picture6Id, Text6, Link6, Picture6, Picture6Url
e.g.
// last image section
public int Picture5Id { get; set; }
public string Text5 { get; set; }
public string Link5 { get; set; }
// added one more image
public int Picture6Id { get; set; }
public string Text6 { get; set; }
public string Link6 { get; set; }
Make the associated changes on the following files (Note: don't forget to make a backup)
1. Changes in Plugin files
Plugins/Nop.Plugin.Widgets.NivoSlider/NivoSliderPlugin.cs
Plugins/Nop.Plugin.Widgets.NivoSlider/NivoSliderSettings.cs
Plugins/Nop.Plugin.Widgets.NivoSlider/Models/ConfigurationModel.cs
Plugins/Nop.Plugin.Widgets.NivoSlider/Models/PublicInfoModel.cs
Plugins/Nop.Plugin.Widgets.NivoSlider/Controllers/WidgetsNivoSliderController.cs
2. Changes in Presention files
Presentation/Nop.Web/Plugins/Widgets.NivoSlider/Views/WidgetsNivoSlider/Configure.cshtml
Presentation/Nop.Web/Plugins/Widgets.NivoSlider/Views/WidgetsNivoSlider/PublicInfo.cshtml
Good luck