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The Magisk Manager is not the the Magisk App. I found out that I had to install magisk mangager from what I downloaded earlier, then install it from recovery. After reboot to the desktop I could open magisk manager but it indicated that magisk was not installed. ??? So they must be 2 different parts. The install option only allowed me to download a zip file. So I downloaded that to the download directory and reboot back to recovery. From recovery I choose to install the zip file. Then I reboot the phone.The Magisk Manager is not the the Magisk App. I found out that I had to install magisk mangager from what I downloaded earlier, then install it from recovery. After reboot to the desktop I could open magisk manager but it indicated that magisk was not installed. ??? So they must be 2 different parts. The install option only allowed me to download a zip file. So I downloaded that to the download directory and reboot back to recovery. From recovery I choose to install the zip file. Then I reboot the phone. The phone takes a long time to boot then does not go to the android desktop, instead, back to the TWRP recovery menu.