You have to edit the manifest.ini file found in:
C:\Users\YourUserName\AppData\Roaming\nvda\addons\DECtalk py3 bundle 2022
edit manifest.ini using notepad.
And edit the last tested NVDA version line so that it reads like this.
lastTestedNVDAVersion = 2022.1
you can also experiment, you could change it to maybe 2052.2 so that way decTalk may work for a few decades to come. and then save the file with control s, s as in sam. then try using decTalk again.
But I wish these decTalks would work with jaws2022 and above.