Look, I don’t wanna force you to do things.
Basically you can move your current customizr directory somewhere elsem outside the themes directory. Then upload the latest stable, and if something goes wrong you can delete the new directory and move the old one in its place. Better if you, before, make a dump of your db or export your “site” through Tools->Export.
Said that, you can stay with your “older” version and replace just what I wrote in the post above. But 3.1.6 should have other improvements, and consider that a new version could come out in days (nic said that somewhere), and could be instructive do that at this stage.
But, as I said, I don’t wanna force you to do anything. And I’m not doing that ??
Last thing: Don’t forget that I gave you an alternative method to have the link above the div, simply with this css line:
article a.round-div {
z-index: 100;
}