You can download it if you know where to look. Try:

ftp://207.46.133.140/bussys/sql/public/fixes/usa/SQL65/Sp3/

Select your processor (Alpha or Intel) and continue drilling down.

Assuming an Intel processor, your full download path is:

ftp://207.46.133.140/bussys/sql/public/fixes/usa/SQL65/Sp3/Sp3Intel/65SP3X86.EXE