Hi Sven,
Thank you for your purchase.

You can add this code on page where your table is located:

<script>
jQuery(function(){
    jQuery(document).ready(function(){
        wpDataTables.table_1.fnSettings().aoColumns[0].bSortable = false;
        wpDataTables.table_1.fnSettings().aoColumns[2].bSortable = false;
    });
});
</script>

Just change the numbers in aoColumns[0] by your needs. Number 0 is first column, 1 is second and so on...

About sorting from your link:
That is the way the sorting is working for string columns.
If you remove that additional information and letters , and change the column type to int you will see that it will sort correctly.

Best regards. 

Hi Sven,


This feature will be included for the upcoming update, no need to worry

Best regards.