First I would like to say thank you for a great tool to use on non rooted devices, I love it.
One thing i noticed is, that most people still won't know what to do with this tool so i will try and help explain better
-download adb and install it, if you haven't already
-download the file OP has at top of post
-extract the zip file
-copy and paste the code at top of OP into NOTEPAD
-change every spot that says "Sleep 1", erase that and copy and paste this there instead "timeout -t 1
-click file at the top left in notepad and click save as name it FireTV.bat
-goto your adb folder of install, usually C:\Program Files (x86)
-erase the "sh file" in the file you downloaded and extracted from the OP earlier
-put the new FireTV.bat you just made in that folder you just erased the "sh file" from
-now put all of those files into the adb folder you just opened and found,"launcher hijack apk, TVLauncher apk, x43Stream apk and your FireTV.bat files."
-hold on shift and right click with your mouse to open and command promnt here, if that doesn't show powershell works as well, it depends on your windows version.
-type "adb connect 192.168.1.8 or whatever you ip is for your FIreTV, this is found by going to settings, device, about and scroll down to network and it will list your IP
-if right it will say connected to device
-now simply left click hold and drag the FireTV.bat file you just created into the command promt and press enter
-that is it should work just fine.
I usually don't do this so I hope I helped a little bit.