There are many places from which to get cracked copies of Poker Office 5, such as Pirate Bay and Torrent Portal.
However, cracked copies will not be able to take advantage of the frequently released updates and patches, could contain spyware and viruses, do not reward the Poker Office 5 team for their hard work, and are illegal.
If you are unable to purchase a full license, then free licenses are available for users who sign up with selected Poker rooms. At time of writing, this offer is valid for 11 different Poker rooms for non-US players, and for 2 Poker rooms for US based players (Poker Stars and Full Tilt).
If you already have accounts at all the Poker rooms on the list, or do not wish to play at the rooms for which you don't already have an account, you can open up a second account using a trusted friend or relative's details. Multiple accounts for a single person are not really recommended as most Poker rooms ban then.
If you plan on doing this regularly, it is best to open up accounts with various online payment services in your friend or family member's name. That way you can open up the new accounts without having to trouble them.
To get your free copy of Poker Office 5, please visit pokeroffice.com.