[Roy Dennis]

The scan now dialog does not allow you to select your own Disc Id unless your file name has a disc Id of Comp 475 appended to it. Example:
Emeli Sande - Breaking The Law - Comp 475.

If instead you choose Import Songs/Index song files dialog you are presented with a different dialog but it gives you more control as to how you import your files.
In this dialog the instructions appear in the left payne but if you select kmh then zip if that is your downloaded format this will bring up windows explorer dialog, brows to the folder containing your files, make sure your files show listed then select, Your five files should show in the upper window if not untick the box for "Hide indexed tracks" it may be that as you have previously imported these files they may not show. Once your files are showing in the upper box highlite one and it should appear in the small window just below marked "field & seperators" Now press the define field order button and try to match your files but choose ignore for the disc id if it's not one of your choice.
Now press the "Add files button". The files should now populate the bottom window with a random disc id but you should be able to type your own in this window Comp 475, set the brand & language and any other settings if you like but most of the other settings can be changed afterwards in the edit dialog. It's just the Disc Id and Bookid that can't be edited after import.
Check all looks correct then Select All finally select "Index files"

Let us know how you get on with that info. The only thing that might trip you up is getting the define field order separators correct.