Q. finding supplemental materials to an iliad article
We have two suggestions for you:
1. If the URL of the website is typed out in the article, copy and paste that address into a browser and see if it will work. If you are not able to copy and paste it using your mouse/pointer, try typing it into the address field of a browser.
2. Go directly to the journal's website (you can find that using Google), find the article and see if the supplementary material is available free.
If these don't work, we will need to know what the article was that you got through ILL. It may be that you can get the Appendix through ILLiad.