I check your site, just WooCommerce plugin can’t install because it exist folder. Please go to your FTP root folder > wp-content > plugins and delete folder “woocommerce” after that please try install again.
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On a page , when we select to show all products from specific category, it is showing upto 12 products only of that category eve if there are 20 products uploaded in that category. Why so? How to enable to show all.