Load custom textures in older versions

[MrElazug]

Hi guys.
I have question.its possible load custom textures in older versions.(like 3.5,3.0)?

if answer is "no" then why?why we cannot load custom textures in older versions?

[JosJuice]

Older versions can load custom textures, but they don't support the new texture name format that was added in January 2015, so you will only be able to use old texture packs.

[MrElazug]

Thanks!