Problem with "download image"

[scharfet]

I use version 3.2.0 of PhocaGallery
I try to make the images downloadable (with its original size).

I HAVE TWO ISSUES:

whien I click on download-symbol error appears:

The requested URL /images/phocagallery/categoryname/subcategoryname/imagetitle.jpg&phocadownload=1 was not found on this server.

But when I delete &phocadownload=1 from
/images/phocagallery/categoryname/subcategoryname/imagetitle.jpg&phocadownload=1 the image appears in the navegator (but not with its original size).

Please, how can I fix this issues?
Thank you