You do not need to buy the plugin. Latest versions of plugins you can find here – https://www.8theme.com/download-plugins/ (to update premium plugins, connect to your server using FTP. Copy extracted plugins folders into wp-content/plugins/).
Looks like the problem on your Home page relates to our Products element. We will fix this bug in next theme update. To fix it on your site before the update, we need temporary wp-admin and FTP access.