Starting from April 22, 2016and planning ahead from the new version 4, we had to make some changes in our Update Servers.
To continue getting new updates, you will be required to install a bundle (attached to this post) in order to update the path to future MT updates.
This patch (bundle) is needed if you want to get any other hotfix for your MT version 3.X.
Remember to unzip the file before uploading to your MT and wait until the web-browser restarts by itself.
The new version will show:version 3.3.9 release date on April 22nd 2016 01.