We have transitioned http://downloads.digitalcorpora.org/corpora/ from George Mason University to Amazon S3. The transition should be completed by 0445 GMT Feb 3, 2021. When the transition is finished, you will also be able to access digitalcorpora at https://downloads.digitalcorpora.org/corpora/.
The old downloads system can still be accessed at http://gmu.digitalcorpora.org/corpora/