I went ahead and created a new thread for this to post my testing on the updated version.

Chrome:

Left Click Download
Payment: Paypal live 0.00- Downloads as a file with .jpg extention
Payment: Paypal live > 0.00- Cant test on live
Payment: Email notification only 0.00- Downloads as a file with .jpg extention
Payment: Email notification only > 0.00- no dl link in the cart or client email to download

Right Click Save As
Payment: Paypal live 0.00- Downloads as an unknown file type and no opition on save to associate as a .jpg
Payment: Paypal live 0.00 > 0.00- Cant test on live
Payment: Email notification only 0.00- Downloads as an unknown file type and no opition on save to associate as a .jpg
Payment: Email notification only > 0.00- no dl link in the cart or client email to downloadd

IE 9.0
Left Click Download
Payment: Paypal live 0.00- Downloads as an unknown file type
Payment: Paypal live > 0.00- cant test on live
Payment: Email notification only 0.00- Downloads as an unknown file type
Payment: Email notification only > 0.00- no dl link in the cart or client email to download

Right Click Save As
Payment: Paypal live 0.00- Downloads as an unknown file type and no opition on save to associate as a .jpg
Payment: Paypal live > 0.00- cant test on live
Payment: Email notification only 0.00 – Downloads as an unknown file type and no opition on save to associate as a .jpg
Payment: Email notification only > 0.00- no dl link in the cart of client email to download

Firefox 15.0

Left Click Download
Payment: Paypal live 0.00- Downloads as an unknown file type
Payment: Paypal live > 0.00- Cant test on live
Payment: Email notification only- Downloads as an unknown file type
Payment: Email notification only > 0.00- no dl link in the cart of client email to download

Right Click Save As
Payment: Paypal live 0.00- Downloads and associates with a .jpg
Payment: Paypal live > 0.00- Cant test on live
Payment: Email notification only 0.00- Downloads and associates with a .jpg
Payment: Email notification only > 0.00- no dl link in the cart of client email to download

What my testing concludes is there are issues with all three browsers and IE 9.0 has no method to download an image as a .jpg. Also none of the handle the image download code the same. I would think they should all work at the least with a left click of the image download link. They should also work with a right click save as on all browsers.

Finally it looks like you can not use email notification as an option for downloads since any order over 0.00 will not provide a download link.