I haven’t seen an official step-by-step guide specifically for updating large projects from Metronic Tailwind 9.1.2 to a newer version, but here’s a reliable approach that many developers use:

Check the changelog/release notes for each version between 9.1.2 and your target. This helps you see breaking changes and required steps.

Create a fresh install of the latest Metronic Tailwind and compare folder structure, config files, and dependencies with your project.

Update dependencies gradually (e.g., Tailwind, plugins) rather than all at once to isolate issues.

Run your project after each step to catch errors early.

Migrate custom components or overrides carefully — merge them into the new structure instead of copying everything blindly.