You cant. They just shut down the server and removed the unlocker app from their site. Maybe, just maybe, they will release a “rewritten version” in the coming months according to some guy on xda who asked them.
This shit is the last asus product Im buying for a loong time if ever.
Let’s see how that goes for them with restructuring and reducing the team significantly. It might be branded a zenfone, but it isn’t going to be the same as the last 2.