This is all normal under the current Dashboard version.
Pressing the release button will:
- Make it visible to everyone who visits a channel that has the Extension installed
- Can be installed by anyone (provided you did not supply a broadcaster whitelist)
- Send a “Extension Released” confirmation email to the Extension’s author email address
If you cannot see your Extension available for download, it is likely because you have a broadcaster whitelist (found in Access tab of your Extension). To change this so all broadcaster may install your Extension on their channel you will have to create a new version of your Extension, going through all the steps again (edit Extension details > upload assets > move to hosted test > mark in review > wait for approval > release).
In fact, for any changes to be visible, including updated screenshots, description, etc, you will have to create a new version of the Extension and go through all the steps again.