Yes the BDE download source (FTP) has some weird permission issues. It's "older version" page does work though.
http://info.borland.com/de vsupport/b de/oldver. html
I was able to download 5.1.0 (newest is 5.1.1) with the "Web self-extracting" link.
I doubt the install would address your issue though. BDE is such an antiquated technology (Timeslips too!) that it's just so hard to get working, esp. on a new platform like Win7 x64...
Also take a look at this thread about Paradox init dir being at C:. Maybe editing that location preference in registry is one way to try.
http://www.technologyquest ions.com/t echnology/ microsoft- office/349 63-access- 2007-error -when-link ing-parado x-bde- tabl e.html