Hi ralgar24 ,
Thank you for your purchase.

The issue cause two same files, and it should be only one. My suggestion is to manually update the plugin

Please take a look at our documentation where you can see how you can successfully update the plugin.

IMPORTANT: Do NOT delete the old version from WP-admin (by clicking “Delete” in the plugins page). If you do, you will lose all your tables!

You can follow this guide :

1.) Download zip from this link

2.) Use FTP to open /yourwordpressfolder/wp-content/plugins

3.) Delete existing wpdatatables folder.

4.) Upload previously downloaded wpdatatables folder through FTP to plugins folder (unzip it)

5.)  Go to WP-admin panel, open Plugins section.

6.) Deactivate wpDataTables, and then activate it again.

Best regards.