Open File Explorer.
Navigate to Main Local Drive (Default C:)
If you can’t see the Program Data Folder enable Hidden View from the View settings of File Explorer.
Navigate to the SketchUp 2024 folder.
Open the folder and find the Materials Folder and copy the contents.
The folder URL is: C:\ProgramData\SketchUp\SketchUp 2024\SketchUp\Materials
Navigate to: C:\ProgramData\SketchUp\SketchUp 2025\SketchUp\Materials
Paste into the Materials Folder:
Now when you launch SU 2025 the materials will be there.
I should note: If you want cleaner folders, open each individually and repaste so you have extra materials in one folder instead of double folders like I have. I’m too lazy to do it right now.