Open Daz Studio. Go to Help \ About Installed Plugins...
Select any plugin, look for "Filename" data in the bottom Information pane.
Copy the full path into an empty Notepad window.
Shutdown Daz Studio.
Go to the Github repository for the desired plugin
Click the "Releases" link in the right-side column.
Find the desired version, click the "Assets" dropdown.
Download the zipped DLL file for Windows (or DYLIB for macOS).
Unzip the DLL to a temporary folder.
Open a second explorer window. Copy and paste the full path that was pasted into the Notepad window into the explorer address bar. The string should end with "DazStudio4\plugins".
Drag and drop the DLL that was unzipped into the "DazStudio4\plugins" folder.
Click "Replace" if asked.
Restart Daz Stuio.
Follow any additional steps on the Github Releases page, such as installing Blender plugin, etc.
Youtube: https://youtu.be/LDDPfygZfgs?si=PqkX_rSi68eiM6yt
Step by Step Installation Instructions: