Screamsi, I was having a hard time too before I tried the process outlined in the below link.
iptvtalk.net/showthread.php?9506-For-all-those-running-Kodi-and-Stalker-Client
I completely got rid of the Stalker addon and manually deleted the file. Obtained a new MAC, then followed the procedure in the other post. One thing I did have to change was the serial #2 in the instructions. I tried it at first with all numbers and it didn't work. I tried it again with all letters and it started working. Frustrating, but you'll get it
iptvtalk.net/showthread.php?9506-For-all-those-running-Kodi-and-Stalker-Client
I completely got rid of the Stalker addon and manually deleted the file. Obtained a new MAC, then followed the procedure in the other post. One thing I did have to change was the serial #2 in the instructions. I tried it at first with all numbers and it didn't work. I tried it again with all letters and it started working. Frustrating, but you'll get it