No, sorry. We updated our solutions to WordPress 5.x. We will only support WordPress 5.x from now on. In case you want to continue using WordPress 4, you could launch a LAMP instance with the PHP version you want to use and deploy WordPress manually
The version 5.0 will be available in AWS in the next future but the previous versions will be available in the marketplace.
You can also launch the community AMI by using the AWS console.
I don't fully understand this question, do you want to receive notifications when a new version of the Bitnami solution is published?