Download MSi file and install it (Replace the code with correct URL and silent install param, run as administrator if needed)

downloadAndInstall.cpp

#include <iostream>
#include <windows.h>
#include <urlmon.h>

#pragma comment(lib, "urlmon.lib")

int main()
{
    std::string downloadUrl = "https://www.uvnc.eu/download/1400/UltraVnc_1409_X64.msi"; // Replace with the actual download URL
    std::string filePath = "D:\\Download\\UltraVnc_1409_X64.msi";            // Replace with the desired download path

    HRESULT hr = URLDownloadToFile(NULL, downloadUrl.c_str(), filePath.c_str(), 0, NULL);

    if (SUCCEEDED(hr))
    {
        std::cout << "File downloaded successfully!" << std::endl;

        // Launch MSI installation
        STARTUPINFO si = {sizeof(si)};
        PROCESS_INFORMATION pi;

        // Run installation (Add more params if needed)
        if (CreateProcess(NULL, const_cast<char *>(("msiexec.exe /i " + filePath).c_str()), NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi))
        {
            WaitForSingleObject(pi.hProcess, INFINITE);
            CloseHandle(pi.hProcess);
            CloseHandle(pi.hThread);
            std::cout << "Installation complete." << std::endl;
        }
        else
        {
            std::cerr << "Failed to launch MSI installation." << std::endl;
        }

        // Delete the downloaded file (optional)
        DeleteFile(filePath.c_str());
    }
    else
    {
        std::cerr << "Download failed: " << std::hex << hr << std::endl;
    }

    return 0;
}