I’m ready to retire my aging Opencart 1.5.4 store and move everything—products, customers, orders, SEO-friendly URLs and purchased extensions—onto a fresh installation of Opencart 3 (or 4 if you feel stability is there). A handful of commercial extensions are installed today, so part of the job will be auditing those plugins, finding compatible versions or solid replacements and migrating any data they rely on. I’m still undecided about the front-end theme: if my current look can be replicated easily, great; if a modern, mobile-first theme is the smarter route, I’m open to recommendations. Core goals • Fully functional, modern site with clean payment handling (no broken checkouts or abandoned carts). • Smooth database migration with zero data loss and minimal downtime. • Updated codebase that’s secure, faster to load and responsive across devices. Deliverable A production-ready Opencart 3/4 store on my server, tested end-to-end—including extension compatibility, payment gateway flows and display on desktop, tablet and mobile—plus a concise hand-over note describing what was carried out and how to manage future updates. When you reply, please outline your upgrade plan, expected timeline and any prior Opencart migrations you’ve tackled. Not in a great hurry. My store is www.custompilotshirts.com