How to edit a wordpress plugin without break its update process

Probably not.

The recommended way to get your enhancements into the plugin is: Send your fixes to the developer and ask her to merge them into the original. If your changes are rather personal customizations, this won’t happen.

If the plugin is written in a strict OOP style you can create a second plugin which extends just the classes from the original as you need it (sort of a child plugin). Unfortunately most plugin developers don’t see this need and don’t write their code accordingly. Be aware of the load order problem.

We could help better if you would describe which plugin you want to extend and what exactly you want to change.

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