You have to perform a separate upload and activation of Revolution Slider zip, which can be found buried within the original expanded Appdev theme zip on your computer. I found mine in the following location:
The instructions for installing revolution slider should show up on the top of the screen in the admin dashboard and you will have to just follow steps recommended there as seen below –
If for some reason, you have trouble with following the onscreen instructions, you can manually install the revolution slider plugin from the location mentioned by Frank above (i.e., /framework/plugins/revslider.zip). Thanks