Download it here:
http://dl.dropbox.com/u/7219062/vzdump-openvz-765-2010_05_18-14_56_01.tar to your /var/lib/vz/dump/ folder
Installation:
1. Move the downloaded file ( vzdump-openvz-765-2010_05_18-14_56_01.tar ) to /var/lib/vz/dump
2.    /usr/sbin/vzrestore vzdump-openvz-765-2010_05_18-14_56_01.tar 765
3.    /usr/sbin/vzctl set 765 –ipadd <the ip address of your new FreePBX>
Read more here