Some Connection-fix installers have been added to the above post. Feel free to try them if you are having connection problems. If the connection fix installers do not help then first see the link at very top of the above post. If none of the LW 4 connection suggestions help then create a new thread in this forum section with your system details suggested at the bottom of the above post.
Main difference between LW 4 & FW is, FW puts the downloads.dat file into the FW preferences folder similar to LW 4.18 & LW 5, whereas LW 4.16 & earlier placed the downloads.dat file into the downloads incomplete folder. The Downloads.dat file is the file which records the details of your incomplete downloads.
This information about the downloads.dat file is only relevant if you should choose to delete your FW preferences folder and using FW 4.17 - 4.21.
A big thank you to
vosgpat our French forum section moderator for the translation.