Article in English: This program is free to use. To download:  Go to https://ninite.com/  Check the "PDFCreator" box in the "Documents" section. Scroll down and click Get Your Ninite Double-click the purple Ninite icon, wait for the PDF Creator app to install, and click Close when prompted. Double-click the PDF Creator icon on your desktop. Click the Windows logo in the bottom-left corner of the screen. Click the folder-shaped icon in the lower-left side of the Start window. If File Explorer opens in full-screen mode, click the two-box icon in the upper-right corner of the window to make the window smaller. Go to the folder in which your PDF files are saved by clicking the folder in question on the left side of the File Explorer window, then hold down Ctrl while clicking the PDFs that you want to combine. Click and drag a selected PDF file onto the PDF Creator window, then drop the files there. This will add all of the selected PDF files to the PDF Creator window. If you need to reposition the File Explorer window so that you can see the PDF Creator window, you can click the top of the File Explorer window and drag the window over. It's a grey button at the bottom of the PDF Creator pop-up window. You'll see this at the bottom of the window. Do so in the "Filename" text field at the top of the page. You'll have to delete the text here first. It's in the bottom-right corner of the window. Your PDF file will be saved in the same folder as the other PDF files that you selected.

Summary in Indonesian:
Unduh PDF Creator. Pasang program PDF Creator. Buka program PDF Creator. Buka menu “Start”. Buka File Explorer. Pastikan jendela File Explorer tidak dalam keadaan terbuka penuh (maximized). Pilih semua berkas PDF yang ingin digabungkan. Salin semua berkas PDF ke PDF Creator. Klik Merge. Klik Merge All. Masukkan nama berkas PDF. Klik Save.