HI Ronald,
Thank you for your purchase.

The Beta testing is over and we released the 2.0.1 update of our plugin which you can manually upgrade it by following this steps:

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.

Auto update is not released yet, but we hope that we will release it soon.

1.How can I remove cell padding to get more across a page?

Sorry but i did not quite understand what are you trying to achieve, can you please describe me more so I can give you my suggestion.

2.Can I make fonts smaller to get more columns to show

There is an option in wpdatatables settings page to choose the font size.

3. Can I have conditions on non-visible columns?  sorting?

Conditions on non-visible columns  are not possible to achieve without some code customization but sorting for non visible columns is available in the plugin build in features.

About the website:
Thank you for reporting this I will forward this to my team so we can investigate the issue.

Thank you.