diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 3021e24..a9a047f 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -286,7 +286,7 @@ jobs:
           Copy-Item "$env:QT_ROOT_DIR\bin\Qt6Core5Compat.dll" "release64\" -ErrorAction SilentlyContinue
 
           # Fritzing needs these folders alongside the .exe to run
-          Copy-Item "fritzing-parts" "release64\" -Recurse -Force
+          # (Note: fritzing-parts is purposefully omitted to shave 300MB; it will be downloaded by the setup)
           Copy-Item "fritzing-app\help" "release64\" -Recurse -Force
           Copy-Item "fritzing-app\sketches" "release64\" -Recurse -Force
           Copy-Item "fritzing-app\translations" "release64\" -Recurse -Force
@@ -310,21 +310,55 @@ jobs:
           echo "ZIP_FILE=$zipName" >> $env:GITHUB_ENV
         shell: pwsh
 
-      # ── 14. Upload build artifact ────────────────────────────────────────
-      - name: Upload build artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: Fritzing-${{ env.FRITZING_VER }}-Windows-x64
-          path: release64/
-          retention-days: 14
+      # ── 14. Compile Online Installer (Slim) ──────────────────────────────
+      - name: Compile Online Setup (Downloads parts)
+        run: |
+          & "C:\Program Files (x86)\Inno Setup 6\ISCC.exe" /dMyAppVersion="$env:FRITZING_VER" /dOnlineInstaller=1 "fritzing_setup.iss"
+          echo "ONLINE_SETUP_FILE=Fritzing-$env:FRITZING_VER-OnlineSetup-Windows-x64.exe" >> $env:GITHUB_ENV
+        shell: pwsh
 
-      # ── 15. Create GitHub Release ────────────────────────────────────────
+      # ── 15. Bundle fritzing-parts for Offline usage ──────────────────────
+      - name: Copy fritzing-parts into release64
+        run: |
+          # Remove the heavy .git folder before copying the parts database
+          if (Test-Path "fritzing-parts\.git") { Remove-Item "fritzing-parts\.git" -Recurse -Force }
+          # Now we copy the full database into release64 for the Offline Zip/Installer
+          Copy-Item "fritzing-parts" "release64\" -Recurse -Force
+        shell: pwsh
+
+      # ── 16. Compile Portable ZIP ─────────────────────────────────────────
+      - name: Compress Portable ZIP
+        run: |
+          $zipName = "Fritzing-$env:FRITZING_VER-Portable-Windows-x64.zip"
+          Compress-Archive -Path "release64\*" -DestinationPath $zipName
+          echo "ZIP_FILE=$zipName" >> $env:GITHUB_ENV
+        shell: pwsh
+
+      # ── 17. Compile Offline Installer (Fat) ──────────────────────────────
+      - name: Compile Offline Setup (Bundled parts)
+        run: |
+          & "C:\Program Files (x86)\Inno Setup 6\ISCC.exe" /dMyAppVersion="$env:FRITZING_VER" /dOnlineInstaller=0 "fritzing_setup.iss"
+          echo "OFFLINE_SETUP_FILE=Fritzing-$env:FRITZING_VER-OfflineSetup-Windows-x64.exe" >> $env:GITHUB_ENV
+        shell: pwsh
+
+      # ── 18. Upload build artifact ────────────────────────────────────────
+      # - name: Upload build artifact
+      #   uses: actions/upload-artifact@v4
+      #   with:
+      #     name: Fritzing-${{ env.FRITZING_VER }}-Windows-x64
+      #     path: release64/
+      #     retention-days: 14
+
+      # ── 19. Create GitHub Release ────────────────────────────────────────
       - name: Create GitHub Release
         uses: softprops/action-gh-release@v2
         if: github.ref == 'refs/heads/master'
         with:
           tag_name: ${{ env.FRITZING_VER }}
           name: "Fritzing ${{ env.FRITZING_VER }}"
-          files: ${{ env.ZIP_FILE }}
+          files: |
+            ${{ env.ZIP_FILE }}
+            ${{ env.ONLINE_SETUP_FILE }}
+            ${{ env.OFFLINE_SETUP_FILE }}
           draft: true
           generate_release_notes: false
diff --git a/fritzing_setup.iss b/fritzing_setup.iss
new file mode 100644
index 0000000..db049e2
--- /dev/null
+++ b/fritzing_setup.iss
@@ -0,0 +1,98 @@
+[Setup]
+AppName=Fritzing
+AppVersion={#MyAppVersion}
+AppPublisher=Fritzing
+AppURL=https://fritzing.org
+DefaultDirName={autopf}\Fritzing
+DefaultGroupName=Fritzing
+OutputDir=.\
+#if defined(OnlineInstaller) && OnlineInstaller == 1
+OutputBaseFilename=Fritzing-{#MyAppVersion}-OnlineSetup-Windows-x64
+#else
+OutputBaseFilename=Fritzing-{#MyAppVersion}-OfflineSetup-Windows-x64
+#endif
+Compression=lzma2
+SolidCompression=yes
+ArchitecturesInstallIn64BitMode=x64
+DisableProgramGroupPage=yes
+UninstallDisplayIcon={app}\Fritzing.exe
+ChangesAssociations=yes
+
+[Tasks]
+Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked
+Name: "associatefzz"; Description: "Associate .fzz and .fzpz files with Fritzing"; GroupDescription: "File associations:"; Flags: unchecked
+
+[Registry]
+Root: HKCR; Subkey: ".fzz"; ValueType: string; ValueName: ""; ValueData: "FritzingProject"; Flags: uninsdeletevalue; Tasks: associatefzz
+Root: HKCR; Subkey: ".fzpz"; ValueType: string; ValueName: ""; ValueData: "FritzingPart"; Flags: uninsdeletevalue; Tasks: associatefzz
+Root: HKCR; Subkey: "FritzingProject"; ValueType: string; ValueName: ""; ValueData: "Fritzing Sketch"; Flags: uninsdeletekey; Tasks: associatefzz
+Root: HKCR; Subkey: "FritzingProject\DefaultIcon"; ValueType: string; ValueName: ""; ValueData: "{app}\Fritzing.exe,0"; Tasks: associatefzz
+Root: HKCR; Subkey: "FritzingProject\shell\open\command"; ValueType: string; ValueName: ""; ValueData: """{app}\Fritzing.exe"" ""%1"""; Tasks: associatefzz
+Root: HKCR; Subkey: "FritzingPart"; ValueType: string; ValueName: ""; ValueData: "Fritzing Component Part"; Flags: uninsdeletekey; Tasks: associatefzz
+Root: HKCR; Subkey: "FritzingPart\DefaultIcon"; ValueType: string; ValueName: ""; ValueData: "{app}\Fritzing.exe,0"; Tasks: associatefzz
+Root: HKCR; Subkey: "FritzingPart\shell\open\command"; ValueType: string; ValueName: ""; ValueData: """{app}\Fritzing.exe"" ""%1"""; Tasks: associatefzz
+
+[Files]
+; Base files (takes whatever is inside release64. For Online, it's missing fritzing-parts. For Offline, it contains fritzing-parts)
+Source: "release64\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
+
+[Icons]
+Name: "{group}\Fritzing"; Filename: "{app}\Fritzing.exe"
+Name: "{autodesktop}\Fritzing"; Filename: "{app}\Fritzing.exe"; Tasks: desktopicon
+
+#if defined(OnlineInstaller) && OnlineInstaller == 1
+[Code]
+var
+  DownloadPage: TDownloadWizardPage;
+
+procedure InitializeWizard;
+begin
+  DownloadPage := CreateDownloadPage(SetupMessage(msgWizardPreparing), SetupMessage(msgPreparingDesc), nil);
+end;
+
+function NextButtonClick(CurPageID: Integer): Boolean;
+begin
+  if CurPageID = wpReady then begin
+    DownloadPage.Clear;
+    DownloadPage.Add('https://github.com/fritzing/fritzing-parts/archive/refs/heads/master.zip', 'fritzing-parts.zip', '');
+    DownloadPage.Show;
+    try
+      try
+        DownloadPage.Download;
+      except
+        if DownloadPage.AbortedByUser then
+          Log('Aborted by user.')
+        else
+          MsgBox('Parts database download failed: ' + GetExceptionMessage, mbError, MB_OK);
+        Result := False;
+        exit;
+      end;
+    finally
+      DownloadPage.Hide; // Hide the download page when done
+    end;
+  end;
+  Result := True;
+end;
+
+procedure CurStepChanged(CurStep: TSetupStep);
+var
+  ResultCode: Integer;
+begin
+  if CurStep = ssPostInstall then
+  begin
+    WizardForm.StatusLabel.Caption := 'Extracting Fritzing Parts database... (this may take a minute)';
+    WizardForm.ProgressGauge.Style := npbstMarquee;
+    
+    // Use native Windows 10/11 tar to quickly extract the downloaded zip file into {app}
+    if Exec(ExpandConstant('{cmd}'), '/c tar.exe -xf "' + ExpandConstant('{tmp}\fritzing-parts.zip') + '" -C "' + ExpandConstant('{app}') + '"', '', SW_HIDE, ewWaitUntilTerminated, ResultCode) then
+    begin
+      // GitHub zip names the extracted folder 'fritzing-parts-master', rename it to what Fritzing expects
+      RenameFile(ExpandConstant('{app}\fritzing-parts-master'), ExpandConstant('{app}\fritzing-parts'));
+    end else begin
+      MsgBox('Failed to extract parts database. (tar exit code: ' + IntToStr(ResultCode) + ')', mbError, MB_OK);
+    end;
+    
+    WizardForm.ProgressGauge.Style := npbstNormal;
+  end;
+end;
+#endif