OK, I've gotten the Fedora Core 3 ISOs. Burned them onto CDs using my yum-updated Fedora Core 2's Nautilus "right click on the ISO and select Write to CD" method. And they all failed the pre-installation media check:
+-------------------| Media Check Result |---------------------+
| |
| The media check of the image: |
| |
| Fedora Core 3 disc 1 |
| |
| is complete, and the result is: FAIL. |
| |
| The image which was just tested has errors. This could |
| be due to a corrupt download or a bad disk. If |
| applicable, please clean the disc and try again. If |
| this test continues to fail you should not continue |
| the install. |
| |
| |
| +----+ |
| | OK | |
| +----+ |
| |
+--------------------------------------------------------------+
The ISOs are complete and with valid md5sums. I haven't burned any CDs since I upgraded from FC1 to FC2. I'll ftp the ISOs to my Windows XP machine and try my luck there tomorrow.