I have downloaded 4.6 basic for windows xp and saved the exe file to my desktop. When I double click on the icon it gives me the following error:
NSIS Error:
The isntaler you are trying to use is corrupted or incomplete. This could be the result of a damaged disk, a failed download or a virus. You may want to contact the author of this installer to obtain a new copy. It may be possible to skip this check using the /NRCR command line switch (not recommended).

I re-downloaded the file 4 times and still get this message.