You should be able to access the extra scenes edition if you've bought it in June. There's no extra fee for downloading updated versions. If you're having trouble accessing the $15 downloads, you can request access via a special form provided by itch.io. You can find the form here.
itch.io's email support is rather slow, but the form I linked to should send an automated message with the download links. Maybe it arrived in your spam folder? If the mail didn't arrive, could you send me a message (perverteergames@gmail.com) with the email address with which you have bought the game (with the purchase receipt attached, if possible)?