Because the artifacts are automatically packed when you download the benchmarks, it might take some time for the download dialog to appear.
@inproceedings{Gao:ICSE2015, author = {Gao, Zebao and Liang, Yalan and Cohen, Myra B. and Memon, Atif M. and Wang, Zhen}, title = {Making System User Interactive Tests Repeatable: When and What Should We Control?}, booktitle = {Proceedings of the 37th International Conference on Software Engineering - Volume 1}, series = {ICSE '15}, year = {2015}, location = {Florence, Italy}, pages = {55--65} }