Why it happens
1- A previous attempt to delete the plugin or theme didn’t succeed, and it left the plugin / theme folder behind.
2- A previous installation attempt was interrupted and left an empty destination folder.
That’s why the system shows a duplicate folder when installing the said plugin.
How to fix it.
1- Log it your site using CPanel or FTP program .
2- Locate the plugin causing error.
3- Delete the plugin
Once you delete the plugin you can start installing the plugin.
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