Is it possible to update the sourece code?

I have the same question. BDAVID, I think that OP knows who to download the source code, but they are wondering whether it is possible to update the source code stored by JotForm. This allows us to tweak the form without having to download an independent copy.

You can download the source code of your form. At that situation, you can edit the code. However when you change (add or remove fields) from your form in the form builder you need to update the form codes on your site by re-embedding the form.

Please check the guide below for more information:

http://www.jotform.com/help/67-Which-Form-Embed-Code-Should-I-Use

If you have any question or issues, please do not hesitate contacting us. We will be glad to assist you.