Hi, you can download the model file by going to this link https://s3.amazonaws.com/hello-tc/spacenet3-code/trained_models/model01.pth
Could you send me your code if it works with this model?  Really appreciate your help! 
This is the source code that was used to train the original models https://github.com/SpaceNetChallenge/RoadDetector/blob/master/pfr-solution/code/train.py 1
I’m using the same code but edited it to load the pretrained model instead of the DPN model, and froze the first few layers of the pretrained model.