MailWizz Upgrade & Abuse Patch

I need my current MailWizz install brought up to the latest stable release while keeping every piece of data—subscribers, campaign stats, templates, custom settings—exactly as they are now. An in-place upgrade with zero loss is non-negotiable... (Budget: ₹600 - ₹1500 INR, Jobs: Database Administration, Database Management, Documentation, Email Marketing, HTML, Linux, MySQL, PHP, System Administration, Web Development)