There is no 32bit agent anymore with 1.6
The problem is the msi file what is used for install package generation.
Your output means that the script is used.
Now i would change the loading statement for the SnapIn to something more like the loading from citrix_farm.ps1.
There is a validation if the SnapIn is available and if it can be loaded.
Or you first insert again some write-host before and after the $tapeJobs = Get-VBRTapeJob.
line.
It is also possible that the write-error inside the catch block is not given to the agent output.
Change the write-error to write-host for a test.