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. Note: Under Zorin 17, You will encounter this issue: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5FD7496A07D323BC. The solution is 1) curl -sS https://packages.zorinos.com/zorin_os_key.asc | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/zorin.gpg or 2) sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5FD7496A07D323BC . Reference: https://github.com/PEAKYCOMMAND/Zorin-OS-Pro/blob/main/zorin.sh

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

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

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