downloaded cduck; tried to open .dmg file, got "image failed to mount; no mountable file systems"

[cyberduck]

anonymous created the issue

I just downloaded Cyberduck - 2.8.1 on my Mac G4, OS 10.3.9. When I opened the  .dmg file ,  I got the message: 

" The following disk images failed to mount: Images: Cyberduck 2.8.1 Reason: no mountable file systems" . I have not had this trouble ever before with Cyberduck, or with any other software package. I downloaded it twice from the web site (first entry in Google under "Cyberduck" .

The first time I had you install it (from an update window). Tried to use it; always got "cyberduck suddenly quit". Then I downloaded it myself, twice, and got the above.