You can use HTML5, JS, jQuery, CSS2+, and anything in between, as long as the console is clean of JS errors and overall look and feel is satisfactory.
You must contact the item author for support, this here is a public forum.
There’s a certain point it’s like playing backwards
I would also be interested in that. Best of luck Dav
No you cannot, they may use different field configuration and naming convention, you can however import (after you have previously exported via WP Import/Export) but again, same problem.