The command which seems to work with v19 of MYOB AccountRight Premier can be found below:
setup.exe /s /sms /v /qn
You might want to install the subsequent updates also - since v19.0.0 there have been a few updates. The current version is 19.7.0 and requires 3 separate updates to be applied. Command lines below:
AccountRight_Premier_v19_5_Update.exe /s /sms /v /qn
AccountRight_Premier_v19_6_1_1_Update.exe /s /sms /v /qn
AccountRight_Premier_v19_7_Update.exe /s /sms /v /qn
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