had the same issue.
You need first to check if you have the OPUS license in your account. This needs to be activated first.
This was not the case for me by default and the support transfered the license to my account.
This is what the support replied to me:
"Our system didn't deposit an Opus license. In the Installation Center, please make sure that you have activated the new license, and then download the latest software updates which are provided at the top.
The Hollywood Backup Singers should then show up under "New Downloads" with a down-arrow button next to it for the download."