If you see the error “The plugin does not have a valid header” when activating a plugin, it usually means:
✅ The plugin files are incorrectly placed.
✅ There’s a conflict in the plugin directory structure.
✅ WordPress is unable to read the plugin’s header properly.
The simple solution is to move plugin files to /plugin root. For example:/wp-content/plugins/plugin-name/plugin-name.php
Move or copy plugin.php to/wp-content/plugins/plugin-name.php
Your plugins’ folder will be a messy, but at least missed plugins will come back and work.