You can find your silent installer here.
Upload Swif silent installer PKG to Mosyle
Go to management > management profile > install pkg
then go into PKGs upload the pkg file and click ALREADY HAVE A .PKG
After uploading the pkg file create a profile in the PROFILE tab with the configuration mentioned in the screenshot make sure you create a device group and add it to the profile.
Once you save the profile, the installation process kicks off as the profile pushes the update to devices added to the device group.