Hi what is the last version of the Thirdlane PBX Multi Tenant ?
The latest version (as of today) is 5.0.43, it is available as a Thirdlane PBX GUI (webmin module) download. Thirdlane PBX download contains an older version that can be updated by installing the latest Thirdlane PBX (Webmin module) GUI after the Thirdlane Advantage installation.
This is a general update mechanism, since Thirdlane Advantage distribution is not going to be updated as frequently as Thirdlane PBX GUI.
That said we are preparing the next version of Thirdlane Advantage that will offer an option of installing the latest Asterisk 1.2 or 1.4.
Third Lane Technologies
Multi Tenant Asterisk PBX