Fix WordPress Plugin Functionality Bug unusual and re-instalation

I’m looking for an experienced WordPress or others developer to diagnose and repair a functionality bug in one of my site’s plugins. The plugin installation has stopped working, so I need a clean, code-level fix that brings the feature back without introducing new issues or breaking theme compatibility.
Please trace the problem, patch it, and explain what you have done so I can keep the solution intact through future updates.

Deliverables
• Updated plugin files with the bug resolved
• Brief changelog or comment block highlighting the exact edits
• Short summary of the root cause and how to replicate the original issue (for my records)

If you’ve debugged WordPress/others plugins before and are comfortable working on this project, I’d love to get this wrapped up quickly.