Step 1: To install macOS 11 on older Mac, you must download two required files from the links below. The following steps will answer “how do I install macOS 11 on unsupported Mac?” The method is easy if you focus on the commands line as well as other installation procedure.
How to Install macOS 11 on Unsupported Mac
Mojave supported Apple computers made from 2012 onwards, while also applied to Catalina. High Sierra was functional on multiple older machines, including those going back to 2009. High Sierra, Catalina and Mojave are known to function perfectly in the older Macs.