This version of the plugin was just released, so my guess is that the update center mirrors don't all have the newest plugins yet. Try waiting for a bit and trying again, or download the plugin from Artifactory here and install it manually.
Still weird. It should not be present in the main update centers until mirror sync is complete.
CC Daniel Beck, maybe there is an infra issue
A user on IRC had the same issue with this plugin 2 or 3 releases ago, but it started working for them about 15 minutes after their initial report. I haven't had anyone report an issue for any other plugins I've released though.
And just now I can install it.