Is it possible to update a texture download?

I am ripping some textures I want to upload, however due to my tool only ripping loaded textures, I would want to update the download if I find out my upload is incomplete. I want to get it up asap, I think I have all textures since I went into every level once, then as every player once, however I have not beaten the game, so there may be a final cutscene with more textures.