So, I installed Cargo, and added Blender. Had the "software not found error", ok, I fixed it, but not before I installed the same Blender software again. So I added it again but selected the blender-launcher.exe.. Now I have 2 entries, I cannot remove. Things then went from bad to worse, as the model is no longer available either.. I can't find it under "downloaded" in both the bottom left "downloaded" button, nor when i filter on models by "downloaded".. So, re-installing Cargo in to the same directories seems to recover downloaded content.. But the duplicated software settings appear as well. So, I uninstalled the blender addon, but now I can't add blender.exe again, because it's already there, but the addon is unavailable in Blender. Ok, i found the article about manual install.. Alot of this grief can be avoided, if allow users to "uninstall" an application configured in cargo.