INTERNAL ERROR: Texture Buffer (limit 4202496 Bytes)is to small to fit 16777216 Bytes!
WARNING: object '3DO/Plane/F-105D/summer/skin1o.tga' of class 'TTexture2D' not loaded
This error may point that texture buffer setting value is too small for using big HD textures.
Or you've failed to install HD texture MOD and it still doesn't work.
Please read again the install instruction text in the release topic of HD / Full color MOD.
Your error is not typical on Su-25 or F-105.
Other mods using HD textures --- like F-16 , F/A-18 and AV-8B+ , karla's CVA , HMS Eagle --- maybe the same.
When your error won't solve after read and follow the text in HD / Full color texture MOD, I think you are better to make a new topic in Hardware section with your full error log and conf.ini , linking this topic , instead of continuing here.
I'm not a hardware / conf.ini setting master, so I cannot advise you in better words.