Hi, Vladimir.

Can we please take a remote look at this domain's back-end of WordPress,

for the one that has the issue?

Please provide me a temporary WP-admin (administrator) user for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. 

We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course, we do not provide login data to third parties. 

You can write credentials here just check PRIVATE Reply so nobody can see them except us.

Hi, Vladimir.

Thank you for the Admin access, I can see what the issue is.

You have the error "Maximum domains active on the licence", and I see on your screenshot from the Store's Domain Manager that you only got 1 domain out of 3 active on this licence.

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This could be an issue with the SSL certificate on your site.

There is a workaround for this issue.

You can edit a PHP file on your FTP in the plugin folder, with any text/code editor.

This is the path of the file :

 ../wp-content/plugins/wpdatatables/controllers/wdt_admin_ajax_actions.php

 around line 1089 ( during updates the exact lines of code change, so i recommend searching  for string "curl_setopt" with CTRL+F"), you will find this line of code:

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

then add this below that :

curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

in the end it should look like this :

And it will bypass the SSL issue, and activate the license. 

Please note, though, that if you migrate the site in the future, and the SSL certificate is not updated, you'll need to add this line again.

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This should solve that error and it should allow you to activate the licence, then you should be able to try and update the plugin the "easy way" directly through WordPress.

Let me know how it goes?

2.  Yes, if everything fails, you can still manually update your plugin by downloading the latest plugin version through your TMS Store Account,

and you can upload the new version.

If you succeed to activate the purchase code in wpDataTables Settings/Activation, the update should be offered in the Plugins section. 

On some WordPress installations, you need to deactivate the plugin first in order to see the update offered, so please try that.

If that doesn't work, try going through Dashboard/Updates. 

See if you can update the plugin through there, and if that doesn't work either, you can follow the manual update procedures explained in this Guide :

Updating the plugin to the latest version

I hope it helps.

Hi, Vladimir.

No problem, i am happy to help.

If you wish to fix the SSL issues of the site, you can go through this Guide from WPBeginners website.

That should help to get a valid SSL certificate, then you won't have to repeat editing of our code in the future,

during updates;

and it might help with the auto-updates.

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You can also see their Guide on How to Enable Automatic Updates for WordPress Plugins here.

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I hope that helps.