Hi I-Min Chen,
I have the same problem, though these were data that I submitted to IMG/ER in collaboration with the PI several years ago and once had complete access to all the raw data. In fact I was able to access and download data as late as July 2015. For some reason this no longer happens, any reason why this was changed? It kind of makes retrieving data for eventual submission to NCBI difficult.
In full disclosure, Kiran is a member of our group, but is in exactly the same situation as myself (had submitted data, has complete access to the annotation available through the IMG/ER web interface, but no access to raw output).
chris