The latest upgrade of SBA is SBA 5.52, built February 17, 2003. You can purchase an inexpensive upgrade from SBA 5.0 to SBA 5.5. You can also update previous release of SBA 5.5 for free.
If you are an owner of any version of SBA older than 5.0, you can e-mail
upgrade@sba21.com   to get the upgrade price.