Path problem 3d warehouse

Hello everyone, I just changed computer. So I wanted to move my sketchup projects to my new PC with my external hard drive. I copied - pasted my projects and my folder “created material” (by myself). Unfortunately I have a problem with the objects imported from the 3D Warehouse, the materials used present me with a “path problem” telling me that the textures would be on a non-existent disc. On my old pc impossible to find a folder with files and textures download … How do I do that? Plus I feel like it’s slowing down my V-Ray calculation a lot.
Thank you in advance for your answers!