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.
That was a misunderstanding- the zenphone line will still be a thing, as will the rog phone line. Both are continuing and will be supported same as they would be previously. There was a post on one of the android lemmy communities, maybe both, with the official statement from Asus