Handling Upgrade Compatibility Issues from Evolution 1.0.5–1.0.12 to 1.0.14

Upgrading multiple older Evolution sites to 1.0.14 is rarely a one-click story. The biggest challenge is not the installer itself, but all the tiny compatibility assumptions hidden in file uploads, manager widgets, editor integrations, and old custom workflows.

The original report came from someone who upgraded multiple sites and ran into several small but disruptive regressions. That is exactly how legacy upgrades usually fail: not in one dramatic crash, but in a trail of compatibility surprises.

The right migration mindset

• expect edge-case regressions in old extras and file handlers,
• test editor workflows, uploads, transliteration, and manager widgets explicitly,
• upgrade one representative site fully before applying the same plan everywhere,
• keep a compatibility checklist, not just a version checklist.

For long-lived Evo projects, upgrade quality depends less on the version number and more on how carefully the surrounding ecosystem is retested.

The better the compatibility checklist, the less painful the actual upgrade path becomes.