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After click Download button above, you’ll get wp-books-gallery-premium-4.4.4.zip. Normally, you have to unzip wp-books-gallery-premium-4.4.4.zip, then find the installable sub-zip to upload to your server or your Wordpress admin area. But there are times you don’t have to do that if there is no sub-zip files inside wp-books-gallery-premium-4.4.4.zip, e.g there is only one folder inside wp-books-gallery-premium-4.4.4.zip.