Hi
You can download the latest full and final Office 2011 install (which is build 14.7.7) from https://go.microsoft.com/fwlink/?linkid=273962. You will need to enter your brand new never been used before product key (25 characters) to activate it.
However, if you have a brand new Mac and it is really new, then you might have Mac OS X 10.15 Catalina operating system, which does not run 32-bit applications. Office 2011 is 32-bit and will not run in Catalina at all. If you have Catalina, you will need Office 2019 via an Office 365 subscription to get the latest features.