Unfortunately no — there’s really not a lot we can do here. As I mentioned before, some sites have code on them that can detect what browser you’re using (among other things) and will prevent users from visiting the site using certain browsers (one common reasons is for browsers like us who have built in ad blockers, although there are many reasons a site might want to do this).
Brave works hard to bypass these detections to continue to allow users to browse the web freely. But the only way we can do that is to update the browser and its related components. Given that you are using such an outdated version of the browser, whatever mechanism we’re using to bypass the error your seeing must not included in that build.
The only way around this at this time would be to update the browser which it does not seem like you can do, given you’re using an outdated OS as well. I do apologize for the inconvenience.