Upgrading HAPP Brand from Prestige 8.2.0 to 10.2.0

HAPP Brand needed to upgrade their Shopify storefront from an older version of their Prestige theme (8.2.0) to the latest release (10.2.0) while preserving the look, feel, and critical functionality of the existing site. The store had accumulated a number of theme customisations and third‑party app integrations over time, many of which were implemented directly in the theme code. Any upgrade therefore had to balance three priorities:

• Maintain visual consistency and core UX so customers experienced a familiar, polished storefront.
• Preserve or replace key theme customisations and app functionality without introducing technical debt.
• Take advantage of improvements in Prestige 10.2.0 (structure, performance, and Online Store 2.0 patterns) without disrupting live operations.

To achieve this, HAPP Brand required:

• A full audit of the current Prestige 8.2.0 theme to identify custom code, app dependencies, and any structural changes that might affect the upgrade path.
• A clear implementation plan outlining which customisations could be migrated directly, which needed refactoring, and where alternative solutions might be required.
• A safe migration process that introduced the new theme as an unpublished draft, allowed for thorough testing across key templates (home, collection, product, cart, content pages), and only went live once all stakeholders were confident.
• Transparent communication around any features or integrations that could not be carried forward into Prestige 10.2.0, including suggested next steps and separate estimates for more complex replacements.

To deliver a safe, low‑risk upgrade, the project was structured into three phases:

1. Theme Audit & Planning
2. Theme Upgrade & Migration
3. Testing & Finalisation.

Theme Audit & Planning

The first step was to duplicate HAPP Brand’s existing live theme, creating a working copy that could be reviewed without affecting customers. Within this duplicate, all customisations were catalogued, including:

• Direct code changes to theme files and snippets.
• Custom sections and blocks.
• Third‑party app scripts and inline integrations.
• Any non‑standard logic around product, cart, or content presentation.

Each item was mapped against the structure and capabilities of Prestige 10.2.0 to determine compatibility and the appropriate migration approach. This produced a practical upgrade plan that:

• Highlighted which customisations could be re‑implemented using the new version’s native features.
• Flagged areas where structural changes in Prestige 10.2.0 meant that like‑for‑like migration was not possible.
• Outlined any known risk points and testing priorities.

The plan also defined how to handle non‑migratable functionality: these were to be clearly documented for HAPP Brand, along with recommended alternatives and separate quotes where additional development would be required.

Theme Upgrade & Migration

With the plan in place, the latest Prestige 10.2.0 theme was installed as a new, unpublished theme in the Shopify store. This provided a clean, modern base aligned with the current best practices for the theme.

Customisations were then re‑applied in a controlled way:

• Where possible, functionality was rebuilt using Prestige 10.2.0’s native sections, blocks, and settings rather than copying legacy code directly.
• Third‑party app integrations and scripts were re‑integrated using current installation methods, with care taken to avoid conflicts and duplication.
• Only the custom code that was still necessary—and compatible with the new theme structure—was carried forward, reducing technical debt and simplifying future updates.

Throughout this phase, customisations that could not be migrated due to structural or functional changes in Prestige 10.2.0 were documented. For each, alternative approaches were suggested, along with a clear indication of whether they could fit within the current project scope or would require additional work and budget.

Testing & Finalisation

Once migration was complete, the new Prestige 10.2.0 theme underwent comprehensive testing before go‑live. Key activities included:

• Verifying all major templates (home, collection, product, cart, checkout where applicable, blog, content pages) behaved as expected across devices and common browsers.
• Checking that app integrations were firing correctly, tracking as needed, and not degrading performance.
• Confirming that crucial user journeys—navigation, search, filtering, add‑to‑cart, and checkout flow—remained smooth and consistent.

Any issues identified were resolved within the unpublished theme, and a final review with HAPP Brand ensured that visual and functional expectations were met. Once approved, the new theme was published, with support provided during and immediately after the go‑live switch to quickly address any unexpected edge cases.

The result was an upgraded, fully tested Prestige 10.2.0 theme, configured for HAPP Brand’s current store, with customisations and third‑party integrations migrated where possible, and a clear record of any intentional changes or retirements. This approach reduced risk, improved maintainability, and positioned the store for smoother future updates, all while keeping the scope focused on a single active store and its existing customisations.