Importing didn't work!

hello Team Kriesi,

i was eager to get my website up and install the demo content from the construction theme:
http://kriesi.at/themes/enfold-construction/

however on import i get the following message,

error message:
Importing didnt work!
You might want to try reloading the page and then try again
(The script returned the following message:

-1)

Haved explored the following threads as well: https://kriesi.at/support/topic/how-can-i-download-the-new-demo-pagestemplates/
i have tried resetting the wordpress and retrying however did not managed to get it solved. please assist :)