Is there I way I can purchase and download all of these? Does the big bundle include the HD vehicle textures? Currently it says I can only download one every 24 hours due to impact on servers.
Yes, any purchase will allow you to download textures for all tanks without time limits. However, there is no single button to download all textures for all tanks with one click, instead it is only possible to download textures for one particular tanks. Thus, any purchases remove the time limits and you'll be able to download textures for any tank you need.