Lori,
The "switch to externally hosted images" link is still in the images section of the lister page. If it does not show up for you, I'd suggest following the link I mentioned above this post in regards to clearing you cache.
( link to the caching post: https://community.auctiva.com/eve/forums/a/tpc/f/4556093...611028842#1611028842 )
Let us know if this helps.
-Kevin