Hi Lazar,
You are absolutely right,there is an issue with the trial version , as rightly mentioned by Burhan they are only offering a trial version for 64-bit Operating Systems.The older versions were available for both 32-bit as well as 64-bit operating systems. I would suggest you to contact the support team of Optiwave they should certainly provide an option for 32-bit Operating systems as well.
Regards
Sahil Singh