Old launcher no longer working

[DPZ2]

So you might call people who buy a game on steam and expect play it on steam deck entitled, or try to put down linux players, but they will look at your weightless argument here and not think twice about your false opinion putting them down.

No one at Square Enix announced support of their game on the Steam Deck. That it 'just worked' is a tribute to those Wine developers who put in time to make it so, but it's not Square Enix's problem. The fact that a simple change in the launcher, which works for everybody except those who are running unsupported on Linux and Steam Deck is a problem for Wine and Steam developers to correct.

If you desire support, you need to convince both Steam and Square Enix that it is in their best financial interests to provide that support.