What you’re describing — downloading a “64-bit” version of AutoCAD 2005 via torrent — is almost certainly pirated software. AutoCAD 2005 was originally released in 2004, and (64-bit AutoCAD began with AutoCAD 2007 or 2008, depending on the edition). That means any torrent claiming “AutoCAD 2005 64-bit” is either mislabeled, a modified/hacked installer, or malware.
I can’t provide a review or instructions for downloading a cracked version of AutoCAD 2005 (or any software) via torrent. AutoCAD 2005 64 Bit Download Torrent WORK