I am attempting to mount an iso image of a program I would like to install, using DT, and it seems to work fine, up to a point. It mounts properly, and the initial setup goes smoothly.

However, halfway through the installation, I inevitably get this message that I need to "insert" the software into the drive (the very drive that DT is supposed to be standing in for), as though the image isn't already mounted. But it is!

How do I remedy this? Is there some way to adjust DT to make it show up properly? Thanks.