Upgrade from v1 is not supported, clean installation is required.
Upgrade from Veeam Agent for Solaris v2 RTM (build 188.8.131.52) is possible.
Please confirm that you are running version 184.108.40.206 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 220.127.116.11.