In order to download the latest version of the Store Manager software please use the blue button (or green arrow) at the top left corner of the Store Manager software.
Also worth mentioning that you will have access to the latest version of the software within 6 or 12 months from the date of your purchase free of charge, depending on the purchased package. Within this period of time you may update your Store Manager as many times as you want.
After that, in order to download the latest version you should prolong your support and update period at:
for PrestaShop Store Manager: https://www.prestashopmanager.com/prestashop-services-on-demand/update-services/
for Magento Store Manager: https://www.mag-manager.com/update-services/
for WooCommerce Store Manager: https://woocommerce-manager.com/product-category/woocommerce-store-manger-updates-category/