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Basically I edited a code of a plugin that I downloaded (I didn’t developed it), now I want to save the changes so that if it got updated it won’t erase my code
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Manually save it. There is no “child plugins” support.
The plugin version number is in the readme.txt and the top-level plugin .php file. Change it, in both places, to a high number, i dunno, maybe 9999.9999.0.0. Then it won’t prompt you to update.
Better: make a copy of the plugin and change its name.