Have a look on the Download section:
gargoyle_1.9.1-ar71xx-generic-tl-wr841n-v10-squashfs-sysupgrade.bin
gargoyle_1.9.1-ar71xx-generic-tl-wr841n-v10-squashfs-factory.bin
So with 1.9.1 the V10 of the TP-Link TL-WR841ND is supported
I have the same issue here. :( In my situation the link is shown as: "http://www.gargoyle-router.com/packages/gargoyle-1.10/ar71xx/default". With that I'm not able to f.e. install the german language plugin. PS: using the "gargoyle_1.9.x-ar71xx-generic-tl-wr841n-v9-squashfs-sysupgrade...