Microsoft Store just updated my high-quality offline Narrator voices like Jenny (US English) and Henri (French). However, Narrator can't use them after the update. And the SAPI 5 driver developed by @gexgd0419 for Microsoft online voices can't use these offline Narrator voices either. Very odd.
@amir Seemingly Microsoft updated the SDK version and changed the decryption key so it stops working. Narrator might be broken because Narrator and the SAPI 5 driver now use different SDK versions, causing conflicts. Seems that Microsoft is aware of this kind of "abuse" and is taking some action. Older versions of the voice packs still work, though.
@gexgd0419 Thanks. Any chance of fixing it?
@amir As for now, you can get the older but working version of the voices here: https://github.com/gexgd0419/NaturalVoiceSAPIAdapter/wiki/Narrator-natural-voice-download-links
Narrator natural voice download links

Make Azure natural TTS voices accessible to any SAPI 5-compatible application. - gexgd0419/NaturalVoiceSAPIAdapter

GitHub
@gexgd0419 Thanks! I'll be grabbing them.