If you still want the legacy 32-bit version for an old Windows 7 machine, look only for the original trial installer 1.10.2.0 from a reputable old-software archive – but know that no legitimate "full" version is free.
It looks like you're looking for a helpful guide regarding downloading (a legacy audio enhancement tool for Windows) in its 64-bit , free , full version. Descargar Srs Audio Sandbox 64 Bits Gratis -UPD- Full