I know it sounds like a silly question, but I tried to download the textures available here at SM, but I just wasn't able to apply them to my object. I did this:
1. created an object
2. applied a blinn material
3. clicked on checkered icon next to COLOR
4. choose FILE from the 2D texture list
5. clicked on the folder icon next to IMAGE NAME and browsed to the file (denfo_blue... for example).

When I click OPEN, I get this message:
Warning: failed to open texture file.....

Thx.

Mário.