Need help to modify lighthome launcher apk with apktool pro

So this has been an on going thing with me, I have download the lighthome launcher that can be installed on most TV Boxes, but the File Manager (4.0) button doesn't work. So have watch youtube videos and opened apktool pro in the TV Box not the PC and I have viewed every file to see how I can fix this problem and just can't seem to find the source code file. Does anybody know or can tell me how to do this? I even took the File Manager from the Beelink and added to the TV Box with the lighthome that is not working 100%.

Maybe I need to do this in the PC with unzipping with rar and modifying a certain file, I even looked at Beelinks lighthome Launcher every file and nothing jumps out at me. I did see this one post:

Extract classes.dex from the uploaded zip file. classes.zip
Copy 'SunvellWin8Launcher.apk' ('/system/app/SunvellWin8Launcher/') to your PC and open with WinRAR or something similar.
Delete 'classes.dex'
Drag the new 'classes.dex' to the same location as the one you just deleted (compression mode 'best' is fine), click 'OK'
Copy the modified 'SunvellWin8Launcher.apk' back over to '/system/app/SunvellWin8Launcher/'
Change permissions of 'SunvellWin8Launcher.apk' to 644 (Using Root Explorer or similar).
Reboot and hopefully the big kodi tile will open SPMC

But don't know it this would work for me and I viewed this classes.zip file and don't know where to start.

Man if I can figure this out maybe I can modify Beelink Sea so the big button would be Kodi.

If anybody can pint me in the right direction that would be so helpful, thanks.