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Did you wait a sufficient time for the loading from DVD to resume? after it stopped.
It might perhaps have buffered fully, and needed to pause, you see.
There's another possibility: your 24K disc might have a damaged surface. Check the surfaces, inspecting by eye, as to whether there might be a severe enough scratch to destroy some data. Or a spot of (opaque) dirt.
If you wipe the disc(s) off, be sure to wipe *across* the disc, rather than around it. Scratching from wiping, will be less damaging if it is across the disc, rather than along the tracks.
After that... have you tried doing an update with Garmin Express first, on the Oregon device?
When dealing with an update for your Garmin device, it is best to simply download, install, and use Garmin Express.
and (if you have a Windows PC) click on the big blue Download button at center bottom of the page. (If you have an Apple, click on the nearby Download for Mac link.) And download Garmin Express' installer to your computer, save it, then double-click upon it to install Garmin Express.
Then start the program, Garmin Express. Then connect your Garmin device. Then use Garmin Express to update your device.