In fact, it's highly encouraged that you do come back and share the complete fix so everyone can benefit. Even if you paid for someone to prepare it for you. (And it would be courteous to first get their permission to share it, but as you said, it's open source ... and since the license is GPL, you're free to share it.)
Thousands of people before you have paid small amounts to hire someone to tweak things, and shared that back here so everyone can benefit. And the ZC dev team have poured countless hours into writing the software which you have been using for free for many years. Care to contribute to the sharing nature of the community, by giving back?
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