diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 487600e24..8e49169a6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -302,6 +302,38 @@ jobs:
           cd ${RUNNER_WORKSPACE}/build-antimony
           ctest -C ${{ matrix.platform.build_type }} --output-on-failure --verbose --extra-verbose --progress
 
+      # Only the windows-latest-release leg has a QTAntimony.exe built with
+      # the exact Qt version (5.15.2, see 'Install Qt' above) win32/antimonyInstaller.iss
+      # expects, so the installer is only packaged there. InstallDir points
+      # iscc at this leg's actual install prefix (see 'Configure CMake for
+      # Antimony' above) rather than the '..\install-release' sibling
+      # directory the .iss defaults to for local/manual runs.
+      - name: Install Inno Setup
+        if: matrix.platform.name == 'windows-latest-release'
+        shell: bash
+        run: choco install innosetup --no-progress -y
+
+      - name: Build QTAntimony installer
+        if: matrix.platform.name == 'windows-latest-release'
+        shell: bash
+        # MSYS_NO_PATHCONV=1: Git Bash auto-converts any argument that looks
+        # like a POSIX path (starts with '/') into a Windows path before
+        # handing it to a native .exe. iscc's /D switches start with '/' and
+        # aren't paths at all, so without this they get mangled and iscc
+        # fails with 'You may not specify more than one script filename.'
+        run: |
+          cd ${RUNNER_WORKSPACE}/build-antimony
+          ANTIMONY_VERSION=$(cat antimony_version.txt)
+          cd ${GITHUB_WORKSPACE}/win32
+          MSYS_NO_PATHCONV=1 iscc "/DInstallDir=${RUNNER_WORKSPACE}/install-antimony" "/DMyAppVersion=${ANTIMONY_VERSION}" antimonyInstaller.iss
+
+      - name: Upload QTAntimony installer
+        if: matrix.platform.name == 'windows-latest-release'
+        uses: actions/upload-artifact@main
+        with:
+          name: antimonyInstaller-windows
+          path: win32/antimonyInstaller_v*.exe
+
       # Valgrind is Linux-only (no Windows support, weak/no Apple Silicon
       # support), so this only runs on one leg of the matrix rather than
       # across every platform/config combination. See MEMORYCHECK_* in the
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 24afeee28..c4a74e614 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,6 +58,13 @@ INCLUDE(CPack)
 
 SET(LIBANTIMONY_VERSION_STRING "v${LIBANTIMONY_VERSION_MAJOR}.${LIBANTIMONY_VERSION_MINOR}${LIBANTIMONY_VERSION_PATCH}${LIBANTIMONY_VERSION_RELEASE}")
 
+# Bare version (no leading 'v'), written to a file so tooling outside of
+# CMake itself -- e.g. the GitHub Actions step that packages
+# win32/antimonyInstaller.iss via 'iscc /DMyAppVersion=...' -- can pick up
+# the current version without parsing this file.
+SET(LIBANTIMONY_VERSION_STRING_BARE "${LIBANTIMONY_VERSION_MAJOR}.${LIBANTIMONY_VERSION_MINOR}${LIBANTIMONY_VERSION_PATCH}${LIBANTIMONY_VERSION_RELEASE}")
+file(WRITE "${CMAKE_BINARY_DIR}/antimony_version.txt" "${LIBANTIMONY_VERSION_STRING_BARE}")
+
 
 option(BUILD_SHARED_LIBS  "Build shared library (Set to OFF to build static libraries)" ON)
 set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING "Choose the type of build, options are: None (CMAKE_CXX_FLAGS or CMAKE_C_FLAGS are used), Debug, Release, RelWithDebInfo, MinSizeRel" )
@@ -681,7 +688,7 @@ if (WITH_QTANTIMONY)
         add_definitions(${QT_DEFINITIONS})
         set(MACOSX_BUNDLE_ICON_FILE ${QTANTIMONY_SRC_DIR}antimony.icns)
         install(TARGETS QTAntimony DESTINATION bin)
-        install(FILES ${QTANTIMONY_SRC_DIR}antimony.ico ${QTANTIMONY_SRC_DIR}antimony_ico.png DESTINATION bin)
+        install(FILES ${QTANTIMONY_SRC_DIR}antimony.ico ${QTANTIMONY_SRC_DIR}antimony_ico.png ${CMAKE_SOURCE_DIR}/win32/README.txt DESTINATION bin)
 
         set_target_properties(QTAntimony PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/QTAntimony/$<0:>")
 
diff --git a/win32/antimonyInstaller.iss b/win32/antimonyInstaller.iss
index 200850201..466820cc6 100644
--- a/win32/antimonyInstaller.iss
+++ b/win32/antimonyInstaller.iss
@@ -1,8 +1,17 @@
-#define MinimalSetupInstaller "AntimonyPythonBindings-2.12.0-win32.exe"
 #define MyAppName "QTAntimony"
-#define MyAppVersion "2.12.0"
+#ifndef MyAppVersion
+  #define MyAppVersion "3.1.3"
+#endif
 #define MyAppSetupIconFile "..\QTAntimony_src\antimony.ico"
 
+; Defaults to the relative layout a local 'cmake --install' with the
+; convention used elsewhere in this repo (an install-release/ dir sibling to
+; win32/) produces. CI overrides this via 'iscc /DInstallDir=...' to point at
+; wherever its own install step actually put things.
+#ifndef InstallDir
+  #define InstallDir "..\install-release"
+#endif
+
 [Setup]
 AppId={{9F5DF3DE-FBE7-4AC4-9AFD-357A1C256847}
 DefaultGroupName=Antimony
@@ -20,32 +29,27 @@ Name: {group}\{cm:UninstallProgram, QTAntimony}; Filename: {uninstallexe}
 Name: {group}\QTAntimony; Filename: {app}\QTAntimony.exe; WorkingDir: {userdocs}
 Name: {group}\README; Filename: {app}\README.txt
 [Run]
-Filename: "{tmp}\{#MinimalSetupInstaller}"; Description: Run libantimonypython installer; 
-; Flags: ignoreversion 
 Filename: {app}\README.txt; Description: View the README file; Flags: postinstall shellexec skipifsilent
 Filename: {app}\QTAntimony.exe; WorkingDir: {userdocs}; Flags: postinstall unchecked
 [Dirs]
 Name: {app}\biomodels
 [Files]
-Source: "{#MinimalSetupInstaller}"; DestDir: "{tmp}"; Flags: ignoreversion onlyifdoesntexist
-Source: ..\install-release\bindings\*; DestDir: {app}; Flags: ignoreversion recursesubdirs createallsubdirs
-Source: ..\install-release\bin\QTAntimony.exe; DestDir: {app}
-Source: ..\install-release\bin\Qt5Core.dll; DestDir: {app}
-Source: ..\install-release\bin\Qt5Gui.dll; DestDir: {app}
-Source: ..\install-release\bin\Qt5PrintSupport.dll; DestDir: {app}
-Source: ..\install-release\bin\Qt5Widgets.dll; DestDir: {app}
-Source: ..\install-release\bin\platforms\qwindows.dll; DestDir: {app}\platforms
-Source: ..\install-release\bin\README.txt; DestDir: {app}
-Source: ..\install-release\bin\antimony.ico; DestDir: {app}
-Source: ..\install-release\bin\antimony_ico.png; DestDir: {app}
-Source: ..\install-release\bin\antimony2sbml.exe; DestDir: {app}
-Source: ..\install-release\bin\libxml2.dll; DestDir: {app}
-Source: ..\install-release\bin\rehashantimony.exe; DestDir: {app}
-Source: ..\install-release\bin\sbml2antimony.exe; DestDir: {app}
-Source: ..\install-release\bin\sbtranslate.exe; DestDir: {app}
-Source: ..\install-release\bin\testantimony.exe; DestDir: {app}
-Source: ..\install-release\lib\libantimony.dll; DestDir: {app}
-Source: ..\install-release\lib\libantimony.lib; DestDir: {app}
+Source: {#InstallDir}\bin\QTAntimony.exe; DestDir: {app}
+Source: {#InstallDir}\bin\Qt5Core.dll; DestDir: {app}
+Source: {#InstallDir}\bin\Qt5Gui.dll; DestDir: {app}
+Source: {#InstallDir}\bin\Qt5PrintSupport.dll; DestDir: {app}
+Source: {#InstallDir}\bin\Qt5Widgets.dll; DestDir: {app}
+Source: {#InstallDir}\bin\platforms\qwindows.dll; DestDir: {app}\platforms
+Source: {#InstallDir}\bin\README.txt; DestDir: {app}
+Source: {#InstallDir}\bin\antimony.ico; DestDir: {app}
+Source: {#InstallDir}\bin\antimony_ico.png; DestDir: {app}
+Source: {#InstallDir}\bin\antimony2sbml.exe; DestDir: {app}
+Source: {#InstallDir}\bin\rehashantimony.exe; DestDir: {app}
+Source: {#InstallDir}\bin\sbml2antimony.exe; DestDir: {app}
+Source: {#InstallDir}\bin\sbtranslate.exe; DestDir: {app}
+Source: {#InstallDir}\bin\testantimony.exe; DestDir: {app}
+Source: {#InstallDir}\lib\libantimony.dll; DestDir: {app}
+Source: {#InstallDir}\lib\libantimony.lib; DestDir: {app}
 Source: ..\doc\examples\ex_antimony_output.txt; DestDir: {app}
 Source: ..\doc\examples\ex_sbml_input.xml; DestDir: {app}
 Source: ..\doc\examples\ex_sbml_output___main_sbml.xml; DestDir: {app}