NP thanks for being open and honest, and making the change! In general, models and textures you purchase you are allowed to use in images and animations, and you can do what you like with the images and animations (sell them, give them away for free), but you can't sell or give away the actual 3D model or the texture, including in any way where it might reasonably be extracted (in the case of a texture, rendering a square painted with the texture from directly above is not sharing a render, it's just pretending you are not giving away the texture ;) ).
Generally, look for things under the Creative Commons licenses like CC0, those are free to download and free to redistribute (but still be careful, as there are other Creative Commons licenses that are free to download but still restrict what you can do with the content you download). In general, better safe than sorry, and unless something has a license that you can point to which explicitly says you can redistribute it, then best NOT to redistribute it :)
