The four provided images are now available for download. Keep in mind these images have vulnerabilities and should not be run in sensitive environments!
NCDC13_Web | NCDC13_Shell | NCDC13_Exchange | NCDC13_DC
These files are also mirrored here.
The VMs can be run using the free VMware Player or the non-free VMware Workstation, which may be provided by your academic institution. If you’d like to run these on a local ESXi server instead, grab VMware vCenter Converter Standalone to convert them to the correct format. (You’ll need to register a free account with VMware to download ESXi and vCenter Converter).