The links that are provided for downloading point to a folder which may contain several files. Your connections may work better downloading several smaller files rather than one large one. To accomplish this, double click on the folder presented by the link. Then you can tick the boxes to the left of each of the files, and they will download individually.
The structure of the downloads for our instruments have changed. They use the .rar split files method. . This requires that ALL of the files be in the same directory at the same time before you start installation. so if there are 4 parts, you need all 4 files xxxx.part1.rar, xxxx.part2.rar, xxxx.part3.rar and xxxx.part4.rar. Then install by selecting the .part1.rar file, and everything will install all at once. This keeps you from having to keep track of what you've installed, and if you've installed them in the right order.