Authoring & build

Command	Effect
/BUILD=<project.bsetup> [/OUT=dir]	Build the installer headlessly (Track A). /FORMAT=msix|msixbundle|exe selects Track C.
/REQUIRESIGNED	CI gate — refuse to produce an unsigned build (exit 1).
/VALIDATE=<project.bsetup>	Validate a project without building.
/PREVIEW=<project.bsetup>	Print a project summary.
/PUBLISH=<project.bsetup> [/OUT=dir] [/UPDATEURL=url] [/NOSIGN]	Publish as ClickOnce (Track B).
/BUILD=<p> /PUBLISHFEED=<dir> [/FEEDURL=url] [/CHANNEL=x] [/MINVERSION=x.y.z] [/REPUBLISH]	Build then stage into a static update feed.

Runtime (shipped installer)

Command	Effect
/S · /SILENT · /VERYSILENT	Silent install. Inno Setup grammar, so Intune/SCCM/winget scripts work unchanged.
/D=<path>	Override the install directory.
/COMPONENTS=a,b	Select components for a silent install.
/FORCE	Allow installing an older version over a newer one (downgrade).
/NORESTART · /RESTARTEXITCODE=n	Suppress / override the reboot-required exit code (default 3010).
/UNINSTALL [/D=path]	Silent uninstall (used by Add/Remove Programs).
/REPAIR [/D=path]	Restore missing or modified files from the payload.
/SELFTEST	Install → verify → uninstall in %TEMP%; exit 0 on success.
/LOG=<path>	Write the install log to a chosen file (default announced, recorded in ARP).

App self-update

Command	Effect
/CHECKUPDATE [/FEED=url]	Report whether an app or module update is available.
/UPDATE [/FEED=url] [/D=root]	Apply an available app update side-by-side.

Exit codes

Code	Meaning
0	Success.
3010	Success — a reboot is required (MSI convention; deployment tooling understands it).
1	Failure.
2	Bad input (missing/invalid script).