Often you will see message:

importing slider setings and data…
Error: slider_export.txt does not exist!

In this case try following traditional method:

1. Unzip slider data file
2. Import slider data using slider-export.txt file
3. Eventualy upload dynamic-captions.css and static-captions.css into the folder wp-content/plugins/revslider/rs-plugin/css/

More info