Error Curl 28 – URGENT PLEASE – Can you install the demo Spa urgently

Hello

I have an error curl 28 when I try to import the demo spa of Enfold.
Can you explain me where to find the file “SPA”, not importing it but having it to put it on my website.
I can also give you my ftp connection and you can fixe that for me.
I’m trying for 1 month, I tried what your pu t in a documentation, and it’s not working :
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How to manually import a theme demo

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 \uploads\avia_demo_files\ folder. If you are importing Enfold 2017 demo, files should be extracted inside \enfold-2017\ so it should look as \uploads\avia_demo_files\enfold-2017\
Go to Enfold theme options > Demo Import and import the demo

It’s for a client, it’s URGENT please.
Thank you for your answer. My email address : (Email address hidden if logged out)
Regards,
Magali