To manually merge files downloaded by IDM, follow the steps given below:
- Open the CMD in your system
- Replace the amount_of_file with the number of files you want to merge
- Replace name_of_parts with the name and extension of files
- Replace name_for_output with the new name and extension of the file
- Syntax: for /l %i in (1,1,8) do type video.mkv%i >> video.mkv