Hi Manchikanti, The MPK of a widget is basically just a zip file what can easily be opened with 7Zip. In the root of the widget there is a package.xml file. That file contains an attribute 'version' and that is what the Appstore is matching. If you adding a new version 1.2.0 for example the version in the package.xml should also be version 1.2.0
If you're building the widget with brackets the package.xml should be in the explorer. Change it there and rebuilt the widget.
If you don't use brackets, you should! That a look at this blogpost: Getting started with the widget development plugin for adobe brackets