Our 480p and 720p videos will always be splitted into parts, for easier upload.
To be able to watch it, you have to join the files first. You can use FFSJ (download here), it’s probably the easiest file splitter and joiner software ever.
After you download all parts, placed them on the same directory and install FFSJ, just double-click the first part (file extension *.001) and click ‘Join’. The file will be joined and placed in the same directory where you place the first part of the file.