- Download the plugin zip file to your computer
- Go to the WordPress admin panel menu Plugins > Add New
- Choose upload
- Upload the plugin zip file, the plugin will now be installed
- After installation has finished, click the 'activate plugin' link
- Copy other WooCommerce PDF Invoices & Packing Slips or WooCommerce PDF Invoices & Packing Slips Premium Templates template (like Simple or Simple Premium) files to the /templates/Custom template folder in the plugin main directory.
- You could rename the Custom Template directory to something else.