Hello,
according to the link below, you have to register on the Broadcom Support Portal. Once you have downloaded the software, you can install it as 'Trial'.
The problem seems to be this:
--> To download the product, you must be registered on the Broadcom Support Portal and have have access to a Support Site ID with an active contract for the desired products.
I am not sure how you can get that, to be honest. At the end of the first linked document, there is a link to a chatbot, I would use that to ask how you can get the trial.
https://knowledge.broadcom.com/external/article?articleId=142814
