Hi, Masoud 

Thanks for reaching out to us

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We are able to help with some basic CSS modifications, and the tables can be customized to a certain extent, depending on what you need exactly.

You can add Custom CSS, and Custom JSS,  but we are limited to how much customization support we can provide.

We always do our best to provide any workarounds, wherever possible,

and you can always make suggestions for improvements,  we do our best to follow what our users need and to add new features/solutions over time, as many as possible.

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We also have this section in our documentation,  hooks for Developers, which can be used if you have coding skills.

Please note that using hooks requires certain level of programming skills and included support refers only to advice.

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1.  In regards to a Demo/Free trial,

you can try wpDataTables before purchasing

 on our sandbox Demo sites ( you can find links for the main plugin Demo,  as well as add-on Demos, in my signature),

and there is a 15-day money-back guarantee period, 

so if you purchase the plugin, you can safely fully test it out, we would provide support along the way,

and if it doesn't fit your needs you can request and receive a refund in that period. ( same goes for all plugins and add-ons)

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2.

Uploading several images at same time in a cell :

At this time, we don't have a built-in feature to achieve this, but you can suggest it for our developers - they will do their best to make a solution in the future.

Please feel free to search on our suggestions page, 

 to see if someone may be already suggested this feature. If you can't see it, feel free to add your suggestion there,  and as more people vote, the feature will move higher on the priority list.

You can certainly follow our changeLog page if you'd like ( it is also available in the plugin dashboard), where we state any changes/new features/bug fixes during updates;

and our newsletter, so you're informed about new features, bug fixes, freebies, etc.

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If you need a solution for it now, maybe it can be done with a high level of custom work, but I am not sure, to be honest. Our developers are very busy at the moment, working on some priority tasks and fixing bugs and issues with our plugins, so they won't be having the time for custom work in the near future.

We can recommend reaching out to someone who does custom solutions, such as WP Kraken, but we can't advise on their pricing.

3.

The same answer will be for displaying images in tables as a slider or image gallery.

Truly sorry to disappoint you, but we don't have something like that available at this time,

and we don't provide custom work.

But you can add a suggestion for the future,  and if you need to hire someone to help to try a custom solution, we can only recommend asking someone like WP Kraken, but can't advise on their pricing.