I just imported, everything went fine.Same result
I tried the new Demo called "MINING 2"
First download version 21.5.9 (full package), then update to 21.7.3So, unfortunately the same result: "The package could not be downloaded."
Theme is from here, all plugins installed and active. Wordpress is a fresh install on my local machine in Local by Flywheel 5.5.3 with Apache, PHP 7.4.1 and so an.