Step 1: Download and install PrestaHero Connect: https://prestahero.com/en/145-prestahero-connect.html
Step 2: Reload your back office, then navigate to "PrestaHero > PrestaHero modules" and click on "Connect to PrestaHero" to connect your website with PrestaHero securely with your PrestaHero credentials.
Step 3: Find the module you purchased (or free) modules and click "Install" or "Upgrade" to install the modules or upgrade your modules any time a new version is released.
*Note: besides installing the purchased modules/themes using PrestaHero Connect, you can also download the modules/themes here: https://prestahero.com/en/mydownloads and install them to your website as normal PrestaShop modules using PrestaShop module manager (or theme manager). Just navigate to "Modules > Module manager" (or "Design > Theme & logo") then upload and installed the downloaded modules/themes.