This is for upgrading from previous DBW installs to 1.71, not good for you.
For the 'Stock 4.07m to DBW 1.71 SuperPack' use the torrent:http://koti.mbnet.fi/raukorpi/SAS_F%27nBigSuperPack.torrent
or the files in rar formathttp://www.sas1946.com/main/index.php/topic,21514.msg239532.html#msg239532
Previously the install procedure looked like this
IL-2 1946 dvd4.08 patch
4.09 skin patch
UP3 RC4 patch
Now you only need the game dvd and the Stock 4.07m to DBW 1.71 SuperPack.