君に会いたい ...Sprinter

Well, details and comments are in chinese version article. Here're only the steps.

Steps

1. Add content deb https://packages.zorinos.com/premium bionic main in file /etc/apt/sources.list.d/zorin.list . For Zorin 15, use bionic, For Zorin 16 use focal. If you also need source code , add content dec-src https://packages.zorinos.com/premium bionic main as well.

2. Create new file /etc/apt/apt.conf.d/99zorin-os-premium-user-agent-temp and add content Acquire { http::User-Agent "Zorin Os Premium" }.

3. Optionally, do apt update && apt install apt-user-agent-zroin-os-premium and then delete file /etc/apt/apt.conf.d/99zorin-os-premium-user-agent-temp

4. To get more layouts of windows manager , do apt install zorin-apperance-layouts-shell-premium zorin-apperance-layouts-xfce-premium

5. you can check what packages are included in Premium via /var/lib/apt/lists/premium