If you use the package share in the deployment, the deployment credentials are not used to access the package share, rather the credentials you entered under Deployment\Security Options are used.
As a general troubleshooting tip we always recommend to test a command in a local CMD on a test computer first prior to entering it as a step in the deployment module. Any command that works in CMD should work in the deployment module.
For general information on deployments we recommend checking out
this section of our knowledge base.
Do note that you'll likely also need additional parameters for a silent unattended remote install. These parameters differ between software packages and are entirely at the software vendor's behest. These usually require some online research.