1. About needing a license key:
The answer is no license key is needed as the giveaway edition of the program for SharewareOnSale is preactivated.
The Vovsoft support team confirms this at this address: https://vovsoft.com/blog/how-to-activate-using-license-key/
(See the user comments).
2. About the API key and URL that are requested in Batch Translator’s Translation-Settings form:
The Vovsoft support team answering a user’s comment on page: https://vovsoft.com/blog/how-to-activate-using-license-key/
directs the user to use the instructions found here: https://vovsoft.com/blog/how-to-use-batch-translator/
“In order to obtain your API key and URL, please follow the steps”
There it provides 3 detailed steps in order to obtain the API key and URL.
This should address the problem.