Confirm Dream Skin is installed
If Dream Skin is missing, complete the Windows installation guide first. Installing the tool and adding a theme are separate procedures.
Extract the downloaded theme
In Downloads, right-click codex-skin-lab-<theme-name>.zip and choose Extract All. Keep the extracted folder intact.
Open the theme library
Open PowerShell and run the command below. File Explorer opens the themes folder created by Dream Skin.
Invoke-Item "$env:LOCALAPPDATA\CodexDreamSkin\themes"Move the complete theme folder
Move the extracted codex-skin-lab-<theme-name> folder into themes. Do not move theme.json or the artwork separately.
Choose it from the tray
Open Codex Dream Skin - Tray from Start. In the bottom-right notification area, right-click the Dream Skin icon, open Saved themes, and choose the new theme. Click the up arrow first if the icon is hidden. Then check Home, an ordinary task, and the composer.