HKEY_LOCAL_MACHINESOFTWAREMicrosoftSpeechVoicesTokens I think that those installers are not designed for Windows 10 because nothing will appear in Windows 10 Language Settings and onto the registry:
I tried to install the runtime and to install the French package MSSpeech_SR_fr-FR_TELE.msi and MSSpeech_TTS_fr-FR_Hortense.msi but it doesn't work. Microsoft Speech Platform - Runtime Languages (Version 11) Here, I see that for old Windows version (but not for Windows 10!) is possible to download and install the Runtime and the Package language: Tts Voices For Windows What I would like to do is to Run the installation of the language. I read some post that mentioned this manual procedure but that doesn't help on my request because it requires that user will install the language: I need to do an installer that adds new Language Voices onto a Windows 10 computer user. We have collected most of high-quality free. 2nd Speech Center supports all the Microsoft SAPI4, SAPI5 (Speech Application Programming Interface) compatible text-to-speech voices! Ace Buddy supports all the SAPI4 voices. Free Text to Speech Natural Voices - SAPI 4 & SAPI 5. But if you want to try out these high quality voices in Windows 10, then you can also download the 30-day trial versions too. You can also purchase very high quality TTS voices for Windows from companies like Ivona, Cepstral or CereProc. One of the sources for downloading free Microsoft and LTS TTS voices is Zero2000.