Question about expansion change

[svaimenazauzeta]

Ok, first of all I am sorry if this has been answered for a like of thousands of times, I am currently playing Cataclysm, on Neltharion, and I would like to switch to WOTLK, so do I have to download whole client or can I do something and just play there?
And no I don't want to transfer my characters that I know it's not possible, just wanna know if I can save time with downloading?
Thanks in advance

[skullatbash]

yes, you gotta download a Wotlk client.
Go here: https://www.warmane.com/download and get "Wotlk (old)"