Hi there. First, make sure that you're actually playing the Premium version. On the title screen, it should say Premium Edition near the logo and you should have a little arrow at the bottom right that lets you change the title screen image. There should also be an option for a bonus image gallery. If you don't have those things, you're not on the Premium Version. Make sure you're downloading and executing the correct game files.
If you are on the Premium Version, you should have the new content. It's all the things listed under Exclusive Content here: https://rjrhodes.itch.io/come-home-premium-edition
If you're still having trouble finding the new content, jump on the Discord and we'll try to help you out.