The documentation you refer to above describes silent installs of the full product. The documentation on silent installs won't help you with upgrading a deployment wizard MSI install.

The install built by the deployment wizard does not need a registration key to run. If your installer includes the server (dbsrv17.exe and/or dbeng17.exe) it will be governed by the license you created when you installed SQL Anywhere. The deployment wizard will include the file dbsrv17.lic when dbsrv17.exe is include (and/or dbeng17.lic when dbeng17.exe is included) in the deployment installer. So the deployment installer is essentially using the registration key you supplied when you originally installed SQL Anywhere.

If for some reason you need to change the license on the servers to which you've already deployed, then you will need to run the dblic.exe utility on each machine. (No doubt there are ways to automate that process.)

If you need to upgrade the version of SQL Anywhere on your servers using the deployment wizard, you will need to create an Upgrade MSI. The catch with creating an Upgrade MSI is that you need to have available your original deployment wizard generated MSI. This is so that the Upgrade MSI can generated components with the original MSI's component GUIDs.

Here is how you would go about doing the above:

1. To your existing installation of SQL Anywhere apply the SP you want to upgrade to, (say for example build 1384).
2. Run the deployment wizard and select "Upgrade Existing Install" instead of "Create New Install" MSI.
3. When you select Upgrade you will be prompted to provide the original MSI. (Note that your feature selection will be the same as that in the original MSI - you cannot change the feature selection.)
4. Be sure to name your Upgrade MSI differently from the original MSI, (e.g., sqlany17_upgrade_1384).
5. Complete the deployment wizard.
6. Run the Upgrade MSI on your servers using the following command:

msiexec.exe /i sqlany17_upgrade_1384.msi REINSTALL=ALL REINSTALLMODE=vomus

The above command will upgrade the image on your servers to build 1384 and will continue to use the existing dbsrv17.lic file as the license. You will not need to provide a registration key.