Hope you would be doing well. I feel happy to see your interestin GoodLock Application. As we know, Goodlock is a nice customization App for galaxy devices but blocked in some regions like Pakistan. Here are some steps to download it.
Firstly, Eject SIM Cards from the device and Connect to a WiFi network.
Secondly, install any VPN and activate it.
After that, Open the App info settings of Samsung Store and tap on Clear data.
Then, Open Samsung store and search for good lock. Since you have installed it, download all its packages like quickstar, nicecatch, etc.
Finally restrict the background data of GoodLock to make it work properly in your region.