You can use Adobe Acrobat to convert an INDD file to PDF format.
Step 1. Launch Adobe Acrobat and click Tools > Create PDF from the top menu bar.
Step 2. Select Single File or Multiple Files and drag and drop the INDD file to the window.
Step 3. The converted PDF will be opened automatically in the Acrobat software. Save it to your local drive. Thus, your INDD file has been converted to PDF.
Step 4 (Optional). Use PDFelement to edit the converted PDF as you like.