Meteor release unavailable

I have an automated server which installs and runs tests against all Meteor versions once they are released. I created it to make sure Minimeteor doesn’t break with newly released versions.

I get the list of available Meteor versions from the GitHub releases page: https://github.com/meteor/meteor/releases

Usually, a new release isn’t ready for download for a day or two. But for Meteor 1.4.4.5, it’s showing an error since a week now:

$ curl https://install.meteor.com/?release=1.4.4.5 | sh

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0 100  7786    0  7786    0     0  18758      0 --:--:-- --:--:-- --:--:-- 18806
Downloading Meteor distribution
Retrying download in 5 seconds...
Retrying download in 5 seconds...
Retrying download in 5 seconds...
Retrying download in 5 seconds...
Retrying download in 5 seconds...

And then it fails.

My question is about the Meteor release process: what’s happening between creating a GitHub release and making it available for download, and how could I maybe improve my test process?