Wow, I am even more impressed because you were able to understand something from that post since I pretty much mix up two different thing (strange what can do a few hour of installing skyrim when one should be sleeping). The wrong exe download (corrected thanks) and the garbled structure files that wasn't due to ddspot ini but to outdated files batch in
https://wiki.step-project.com/Guide:DDSopt#tab=QUICK-START_GUIDE
Optimize Vanilla Skyrim Textures
Extracting & Cleaning Vanilla Texture BSAs (brief version)
.... Download the BAT files, and extract the entire contents into the "Working" directory adjacent to Vanilla Extracted
That download give : https://wiki.step-project.com/images/0/05/Batch_Files_for_DDSopt_guide.7z , a batch of files from august 2013!
Can I suggest making all batch file reference directed toward the same spot, a new tab in the guide for example, so at any future update only one reference is to be updated?