The 32bit version of the DSP Builder Standard blockset can be used by doing the following.

1. Launch MATLAB as follows:
"Start" ⇒ "All Programs" ⇒ Altera xxx ⇒ DSP Builder ⇒ Start in MATLAB xx(32-bit)

2. Run the following command from the MATLAB command line: alt_dspbuilder_setup_megacore

For details, please refer to the URL link below.
https://www.altera.com/support/support-resources/knowledge-base/solutions/fb119271.html