Generate windows installer.

.github/workflows/installer.yml

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+---
+name: Windows Installer
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: "Version to install (e.g. 22.0.0 or 22.0.0-rc.1)"
+        required: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if:
+      ${{ github.event_name == 'workflow_dispatch' ||
+      github.event.workflow_run.conclusion == 'success' }}
+
+    steps:
+      - name: Download Artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: stellar-cli-${{ inputs.version }}-x86_64-pc-windows-msvc.tar.gz
+          path: stellar-cli.tar.gz
+
+      - name: Uncompress Artifact
+        run: tar xvf stellar-cli.tar.gz
+
+      - name: Install Dependencies
+        run: apt-get update && apt-get -y install nsis
+
+      - name: Set up environment
+        run: |
+          echo VERSION="${{ inputs.version }}" >> GITHUB_ENV
+          echo STELLAR_CLI_BINARY="stellar.exe" >> GITHUB_ENV
+          echo STELLAR_CLI_INSTALLER="stellar-cli-${{ inputs.version }}-x86_64-pc-windows-msvc.exe" >> GITHUB_ENV
+
+      - name: Build Installer
+        run: |
+          makensis installer.nsi
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: ${{ env.STELLAR_CLI_INSTALLER }}
+          path: ${{ env.STELLAR_CLI_INSTALLER }}

installer.nsi

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+OutFile "$%OUTPUT_FILE%"
+InstallDir "$PROGRAMFILES\Stellar CLI"
+RequestExecutionLevel admin
+
+; Define WM_SETTINGCHANGE since NSIS doesn’t natively recognize it
+!define WM_SETTINGCHANGE 0x1A
+
+Section "Install"
+    SetOutPath "$INSTDIR"
+    File "$%STELLAR_CLI_BINARY%"
+    WriteUninstaller "$INSTDIR\Uninstall.exe"
+
+    ; Create a shortcut in the Start Menu
+    CreateDirectory "$SMPROGRAMS\Stellar CLI"
+    CreateShortCut "$SMPROGRAMS\Stellar CLI\Uninstall.lnk" "$INSTDIR\Uninstall.exe" "" "$INSTDIR\Uninstall.exe" 0
+
+    ; Add an entry to the Windows "Programs and Features" list
+    WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Stellar CLI" "DisplayName" "Stellar CLI"
+    WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Stellar CLI" "UninstallString" "$INSTDIR\Uninstall.exe"
+    WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Stellar CLI" "DisplayIcon" "$INSTDIR\stellar.exe"
+    WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Stellar CLI" "DisplayVersion" "$%VERSION%"
+    WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Stellar CLI" "Publisher" "Stellar"
+    WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Stellar CLI" "InstallLocation" "$INSTDIR"
+
+    ; Add install directory to the PATH
+    ReadRegStr $0 HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path"
+    StrCpy $1 "$0;$INSTDIR"
+    WriteRegStr HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path" "$1"
+
+    ; Notify Windows that the PATH has changed
+    System::Call 'user32::SendMessageA(i 0xFFFF, i ${WM_SETTINGCHANGE}, i 0, i 0)'
+SectionEnd
+
+Section "Uninstall"
+    Delete "$INSTDIR\stellar.exe"
+    Delete "$INSTDIR\Uninstall.exe"
+    RMDir "$INSTDIR"
+
+    ; Remove the Start Menu shortcut
+    Delete "$SMPROGRAMS\Stellar CLI\Uninstall.lnk"
+    RMDir "$SMPROGRAMS\Stellar CLI"
+
+    ; Remove the entry from "Programs and Features"
+    DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Stellar CLI"
+
+    ; Restore PATH without the installation directory
+    ReadRegStr $0 HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path"
+    StrCpy $1 "$0"  ; Store the original PATH in $1
+
+    ; Remove install directory from PATH (manual string removal)
+    StrLen $2 "$INSTDIR"
+    loop:
+    StrCpy $3 "$1" "$2"
+    StrCmp $3 "$INSTDIR" 0 +3
+    StrCpy $1 "$1" "" $2
+    goto loop
+
+    ; Write the modified PATH back to registry
+    WriteRegStr HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path" "$1"
+
+    ; Notify Windows that the PATH has changed
+    System::Call 'user32::SendMessageA(i 0xFFFF, i ${WM_SETTINGCHANGE}, i 0, i 0)'
+SectionEnd