How the Supported Platform works?

Hello there. I am using Mac and I just want to know what to have in to account when I look to the supported platform of the asset I want to purchase.

I have dowloaded a free package recently for testing; it was marked as just Windows supported, and it works on my Mac. Looking for an answer I have seen people mentioning that since it has not been tested on Mac (or other platforms) yet, it does not appear us a supported platform even if it could work.

So, what shall I do? Get in touch with the developer to know if will be tested on Mac in the future, wait till others test it and ask? I guess the answers are obvious, but I am new around and I prefer to ask.

I would be grateful with an answer, or if someone shares a link to somewhere with this information.