New Personal computer-Will i need to download GW2 once again in full

As title says, i will have a new computer in the subsequent week or so, and since i got the digital copy i'm asking yourself if i will have to redownload the entire gw2 gold game.

I will have my current harddrive added to the new personal computer so im hoping i can just run it from there, even though i wont be on the OS fitted on it.

The other hope is that i can basically copy the relevent directories to my new pc's hybrid drive for a bit of a performance improve and simplicity of it being on the right drive.

Any data about either option or anything I have but to think of will be amazing.
Admittedly my connection is pretty fast compared to most men and women i know, plus the first time it was downloaded within three-4hrs, precise time i don't know as i had gone christmas shopping. Even so i'd rather not are compelled to download it if i don't need to.

Also i will say if i did place this in the wrong section i'm sorry, the other sections did not seem right, so i just put it in general.