Version 12 of CDFPlayer includes wolframscript but, contrary to previous versions of CDFPlayer installations, this time wolframscript does not work out of the box. Instead, it requires ID and passwd. I tried to insert my Wolfram user ID and passwd but it does not work. On the other hand, it tells you to get a developer license for free at https://wolfram.com/developer-license , but that page does not exist (yet?).
What is going on?
The page https://wolfram.com/developer-license (redirecting to https://www.wolfram.com/engine/free-license/) does exist now. Does that Free Wolfram Engine for Developers work for you?