Hi Dalmiro,
I downloaded the latest TeamCity plugin from the link (not the tools) and that has version 2.6.3.60 there. Which is newer that what I had, but still not 3.x. It has the same problem. Is it possible to update TeamCity plugin to the latest level of octo.exe? It is a bit strange that version there is not the latest.
[13:38:53][Octopus Deploy] Running command: octo.exe create-release --server SERVERNAME --apikey SECRET --project PROJECTNAME --enableservicemessages --version 1.1.0001.102820 --package='Stop App Pools':1.1.0001.10229
[13:38:53][Octopus Deploy] Creating Octopus Deploy release
[13:38:53][Octopus Deploy] Octopus Deploy Command Line Tool, version 2.6.3.60
[13:38:54][Octopus Deploy] The package argument ''Stop' does not use expected format of : {PackageId}:{Version}
[13:38:54][Octopus Deploy] Exit code: -1