Thank you all for trying to help with my textures problem.
I have downloaded 6 assets from the Community page of MakeHuman with 3 successes and 3 failures.
I downloaded a different asset by Margaret Toigo (the Turtleneck from Shirts/TShirts) and it showed up successfully.
The Cocktail Dress (by punkduck Gowns/Robes) and Crude Swimsuit (by Joel Palmius Unsorted/Other) were also successful.
The Red Skirt by reizibarrientos (Skirts) showed the dreaded orange and grey stripes which I consider unsuccessful.
The other 2 unsuccessful downloads were the Dress Bodice by Margaret (the prime suspect in this topic) and F Dress 02 (by Mindfront Gowns/Robes).
These 2 latter assets were missing textures which I am now convinced is the fault of my laptop.
Oops. I looked closer at Red Skirt and noticed that the texture in MHmat was the wrong filetype. I changed it and now I see a tartan skirt in MakeHuman. So, 3 and 1/2 out of 6 ain't bad!