I am trying to download the DSP builder software (or Quartus II software) for 32-bit PC. Where is the link for this downloading?
From the following website:http://www.altera.com/education/univ/software/quartus2/unv-quartus2.html "Finally, we would like to inform you that starting in Quartus II version 14.0 there will no longer be support for 32-bit computers (Quartus II V14.0 can only be used on 64 bit computers), and also there will no longer be support for the Cyclone III devices (used on DE0 boards), and Stratix III devices (used on DE3 boards). Users of the DE0 and DE3 boards should continue to use Quartus II V13.1, or earlier." So it looks like the only options are to either use an earlier version of Quartus or as leon_heller suggested, get a 64-bit PC.