We are sure that our theme and plugins does not include any viruses or malware code. You can download original files from ThemeForest (full theme package with plugins) and check. If you found a virus or your antivirus found any malware code, we would recommend you to contact your hosting provider to scan whole the WP installation, maybe DB to remove the injections and protect your site for the future.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.