You should dispute this with the developer, but I have the vague impression that he will tell you the download is not possible since the entire kit is delivered as one package when you buy it and the only way to install it is through the supplied CD.
There is also another possibility to insert the CD on another PC and copy its contents, then transfer it using a USB drive to the target computer to install it. However, problems arise when the software in question requires the CD present at all times. Then a portable CD-ROM might be necessary to have.
