In fact I would have attributed 0 star if this would be possible! Reasons:
1) An IM credential is required t o use the program… but credential is not provided.
2) The number of words which you are allowed to recognize are limited to 500 per month… but this is not indicated before you install the program!
1. Vovosoft instructed how to obtain the free credentials, from IBM, 3 comments before yours. Also, if unsure how to use or get them, FAQ and the Vovosoft blog explain.
2. It’s 500 minutes per month, not words, and is set out in the Shareware description “The current version supports IBM Cloud Speech to Text API which can convert up to 500 minutes per month for free.”