You will notice you might not be able to [open in new browser ],you definitely can’t run voltbuilder.follow the steps below if your old app uses bs4,and you will be fine .
(1)open a 2nd instance of app studio, from file new..copy the config and paste to your new prj,config.
(2) Delete away white space config(can’t remember the actual line),but running voltbuilder will tell you,just delete one line)
(3)Create another 2 icon(not the 512x512 icon,png will be fine),and set the property to your 2 file name in voltbuilder section.