As far as I can tell, the code on GitHub (https://github.com/vicariousinc/science_rcn) only works for the MNIST dataset.

Unclear how to run on the CAPTCHA examples referenced in the paper, even though they did make the datasets for those examples available.

Bummer, a big part of what the paper mentions about being so great with this RCN model is being able to segment sequences of characters (of indeterminate length even!). Sad that I cannot easily verify this for myself!