Their whole PC is outdated. I'm not even sure OP's CPU supports 64 bits…
And yes, no one is going to use a texture pack that only works with 4.0 (or that you have to convert manually). That version is 3 years old and there's no good reason for using it when there is 5.0.
And yes, no one is going to use a texture pack that only works with 4.0 (or that you have to convert manually). That version is 3 years old and there's no good reason for using it when there is 5.0.