Can't apply texture to object without it reverting back instantly

[Xynardo]

Hi all, big SL newbie here. I recently bought an avatar model and then a skin for the avatar. For the skin to look complete, I'd need to put the new skin texture onto the head, but whenever I do this, it instantly reverts back and never applies to the model at all. I'm getting pretty frustrated by this, and I really don't know what to do. I haven't selected multiple models, I've selected the right one, the texture is for the right object but it simply will not stick. Anybody got a solution?

[Kwakkelde Kwak]

My first step would be to contact the creator. In your inventory right click the texture and select "properties". It should show you who made it.