The only thing I can think of is the blend file was created in earlier version of Blender than the one you are using this tutorial might help since I recall this being an issue when when opening files from version 2.79 and older into the new 2.8 at the time Opening old .blend files (missing images) I hope this helps

Lobo3433

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Forum: Blender

Subject: Opening a Blender file with textures problem