Well, when I said that the URLs would be stable, I did not account for the possibility of
the datacenter burning down...
Packages have been uploaded to a different DC, so stuff should now be back up, but, this had an unfortunate consequence for the
update-kobostuff script, since it was kinda assuming that the URL would pretty much stay put

.
Anyway, you can either update via the KoboRoot package, or you can simply fix the URL with this trivial patch:
Code:
--- /usr/local/stuff/lib/libotautils.ori
+++ /usr/local/stuff/lib/libotautils
@@ -62,7 +62,7 @@
}
## Quick'n dirty OTA index parsing...
-OTA_BASE_URL="https://storage.sbg.cloud.ovh.net/v1/AUTH_2ac4bfee353948ec8ea7fd1710574097/mr-public"
+OTA_BASE_URL="https://storage.gra.cloud.ovh.net/v1/AUTH_2ac4bfee353948ec8ea7fd1710574097/mr-public"
# We'll want to work in a tmpfs
OTA_WORKDIR="/tmp/stuff"
OTA_INDEX="${OTA_WORKDIR}/ota.html"