When I setup a link from within RDM, I get an error that the internal browser built into the application is not supported. Further checks shows the info below using https://www.whatismybrowser.com/
Internet Explorer - IE 11 / Google Chrome - Chrome 75 / Firefox - Netscape Navigator 5
How can I update the internal browsers to point to the actual browsers that I use which is updated or how to update the internal browsers of RDM to support the websites I use?
I suspect that you are trying to open your sessions in embedded mode. In embedded mode, we use third party application for Firefox and Chrome. For IE, we use a Microsoft ActiveX.
That being said, you cannot update those browsers yourself.
If you would like to use your local browser (which is up to date), I would recommend launching your session in external mode and use our web login to perform the authentication.
Our web logins can be downloaded here