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After activating the theme, there’ll be suggested plugin listed at the top (if there aren’t, you can go to ‘Appearance > Install Plugins’ section as well ).
Try installing and activating these following plugins ( as it effects the importing process ). You can also install all suggested plugins at this step as well.

import-sample-data

Then, go to ‘Appearance > Gecko Sample Data > Choose Layout > Import Demo Data’

Follow the steps mentioned on the screen, then, you’ll get the site like the demo 🙂

Can’t import demo sample date

You can add below code in function.php line 2 in themes/gecko/function.php and try import again. This problem of hosting limit memory. After import complete you can remove code.

ini_set('memory_limit','128M');