The download link is still working, http://www.mediafire.com/download/suf3k0b7zq57zpu/Layout_Riva.mgc
But it should be fairly straightforward, the mounting command for the iso on my phone is this:
imgmount d /storage/0000-0000/iso/dsa3.cue -t cdrom
Simply replace the “/storage/0000-0000/iso” part with the correct path configuration on your device, and it should work. IIRC , you do have to add the -t cdrom switch at the end to make it work, so that might already solve your issue.