1)You can download both the datasets using below command which will help them to download in background and on compute mode. This helps on the download issues.
1a) echo wget http://www.robots.ox.ac.uk/~vgg/data/text/mjsynth.tar.gz | qsub
1b) echo wget http://www.robots.ox.ac.uk/~vgg/data/scenetext/SynthText.zip | qsub
2) To make them available on /data folder requires license. A different team works on this and we approached them to check the feasibility.
Please go ahead and download them on your work space as of now.