Everyone please provide your Apple contacts with how much you appreciate the lack of a 19H15 full installer. They managed to release a full installer of Build 19H4 last week that was solely for the 2017 21.5" iMac. Since 19H15 is intended for all Catalina capable Macs a full installer for it would certainly be more useful/appropriate.
@sdagley Right on. JAMF engineering please let Apple know on our behalf as well - it would save lots of admin work for Apple to produce full images for Supplemental and later Security Update builds... at the very least if they aren't available for download they are what should be delivered via internet recovery. It's silly in 2020 with super fast SSDs and NICs that we're strangled in volume deployments by Apple's premature murder of imaging, and then have to suffer these cuts and wounds of installing a base OS and then updating it immediate afterwards. What are we supporting here, Windows 95? At least MS provided a way to slipstream updates for admins. I've tried those package installation switches ( startosinstall --installpackage ) and it produces unbootable systems for Security Updates. I know, this is not strictly a JAMF issue and imaging is dead but the amount of labor hours lost esp when you're deploying systems for developers and want to include things like xcode or heaven forbid MS Office which still unpacks itself to /tmp and then uses ditto to move its components into /Applications... It makes me long to manage modern Windows!
Apple released a full installer for 10.15.7 Build 19H14 yesterday. You can also use installinstallmacos.py or erase-install (which itself uses installinstallmacos.py, but adds a few options) to download it. I've found those to be somewhat more reliable than the
softwareupdate --fetch-full-installer --full-installer-version 10.15.7 (if you're on a Mac already running Catalina)