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I tried : too many extensions don’t install! it doesn’t work!!!!!!

Please add following line to Functions.php file in Appearance > Editor
add_theme_support( ‘avia_demo_store_downloaded_files’ );

Download the zip file of the demo you would like to import from https://github.com/KriesiMedia/enfold-library/tree/master/demos
Extract it in uploadsavia_demo_files folder. If you are importing Enfold 2017 demo, files should be extracted inside enfold-2017 so it should look as uploadsavia_demo_filesenfold-2017
Go to Enfold theme options > Demo Import and import the demo