Total Overhaul Beautiful Cities of Morrowind mod #258 Usage Notes
Missing textures issue is caused by esps for patches being provided before installing the related mod, such as Sloads and Slavers however the Sloads and Slavers mod doesn't get installed until mod #322.
Recommend to update Usage Notes to include a warning about missing textures at this point, in order to prevent a user from trying to troubleshoot these missing textures when they will be fixed later on in the modlist. The user could also leave the patches added by BCOM disabled until all mods have been installed, and to troubleshoot at that point.