Thanks for contacting us.
Regarding the rev slider, the licence is shared with all buyers, it’s a bundled plugin, so you can rely on us for updates.
We’ve just released an update (V2.2.8) with the latest Rev Slider update bundled
Regarding the demo content, please allow me admin access so that I could figure out what’s wrong.
the usual suspects are:
1- php memory limit
2- max input vars limit
3- max execution time limit