You can get the drivers of ADB from their official website. Otherwise, you can not use this method anymore.
Also, an ADB driver needs to be installed on your desktop. In this method, a desktop is a primary device which you have to use. This method is found to be worked on many of the Android TV. This is the best method to sideload apps on Android TV.
Method 04- How to Sideload Apps on Android TV using ADB Know more: Top 10 Best SNES Emulators for Windows, Mac and Android