This IR set is included in the full Altiverb install (both version 7 and version 6).
If you use Altiverb 6, please use the latest IR Installer complete to install all IRs for Altiverb 6. You can request a link to this here:
If you use Altiverb 7 make sure you download the full (3.5 GB) Altiverb 7 installer. This one installs Altiverb 7 and all IRs: