how make possible to download a file different from picture

[gbattine]

Dear all,
I need your help on phoca gallery, I never used it.
I watched this demo

https://www.phoca.cz/demo/modal-box

In this demo there is download image button, to download image. What I need is to download a different file from image.
Is it possible?
This is scenario...I've thumbnail, clicking on thumbnail full image must be shown (like done now), but clicking on "Download" I need an additional file must be downloaded, for example a .psd file, not just the image. Is it possible?
Thanks

[Jan]

Hi, then you should use external link, like e.g. here:
https://www.phoca.cz/joomla-templates

Jan