Simple Image Gallery Pro: download link in the popup is not working for me

I have bought Simple Image Gallery Pro today, installation worked fine, I tested the plugin with a gallery and everything seems to work like fine except the download link in the popup.
It does not appear the text, nor the diskette icon.
I have read all topics I found related to this issue, (forum.joomlaworks.net/index.php?topic=7766.0 was the most related to my problem but there was no images/stories path text in my plugins/content/jwsigpro/sigpro.download.php).
None of them orientated me to figure out where or what to do in order to solve my problem.
I really need to make images available for download.

I have this plugin working on a joomla 1.5.15 version with k2 component.

I thank in advance for any help provided, and hope to be clear enough despite of my poor English

Did you enabe original imagedownload link in the popup at the SIG pro parameters?

Yes, as I tried to show on the image I have attached.
Really I an relatively newbie, so at this point I have no clue of what to do.
Any other suggestion?...

Please pm me access to your backend.

Yes, as I tried to show on the image I have attached.
Really I an relatively newbie, so at this point I have no clue of what to do.
Any other suggestion?...

I add the setup I have in the plugin.
Hope someone would be able to help.

Sorry, I have it local

Put the related module position.

Sorry, but I do not understand what you mean with a related module position, since I have no module related enabeled. Is it possible for you to show me some how or reference me what kind of position shoul I put: ex: inset.
Thanks in advance.

This is optional. You may use a module position so as to load the pop up.
However, could you please provide me with a name of an image you use?

disco1.jpg