Upgrade from v1 is not supported, clean installation is required.
Upgrade from Veeam Agent for Solaris 2.0 RTM (build 22.214.171.124) is possible.
Please confirm that you are running version 126.96.36.199 or later prior to upgrading. You can check this using veeamconfig --version in Oracle Solaris command-line interface. After upgrading, your build number will be 188.8.131.52.