Hello Adesh,

Can you please try again? And please click on Find updates on the left top in Extensions > Updates. After that, you'll be able to see the update notification for sellacious.

You can also update your sellacious directly by manually installing the updated the sellacious. You need to download the sellacious from https://www.sellacious.com/download when you unzip the downloaded file you get 3 folders. In "Install in Joomla" folder are sellacious packages. First, install the file pkg_sellacious_v1.6.0.zip in your Joomla and after this install pkg_sellacious_extended_v1.6.0.zip. Your sellacious is updated now. You can also update your sellacious default template from "Template Only" folder.

Before updating please take a backup of your site.

I hope this helps.

Thank You
-Team Sellacious