Switching to Android:AndroidPlayer is disabled

I am trying to make my world cross platform and I made a dupe of the project and when I click “Switch Build Target To Android” I get a error saying “Switching to Android:AndroidPlayer is disabled” Do I have to install something? I can’t use Unity Hub because the installs fail all the time and I downloaded unity manually without Unity Hub so what do I do?

Download and install Android Target Support: https://download.unity3d.com/download_unity/008688490035/TargetSupportInstaller/UnitySetup-Android-Support-for-Editor-2018.4.20f1.exe