8,000 files Sounds about right.
Can download from another location, move files on a 8GB USB, bob's your uncle. Guild Wars doesn't need an installer BTW.
Rits probably easiest, but imo boring (SOS spirit spammers, and that kurzick spirit teleport skill).
Mesmer the most interesting, but hard to play. Usually for experienced players. Heroes make great mesmer interrupters.
Eles easy for starters and versatile. Pretty straight forward point and shoot class. Fun combos with snares and AoEs.
Assasins have poor survival rate especially beginners, but fun class. Works with combos and good heal target for a prot monk (Love playing with a decent assassin

).
Rangers are relatively and quite fun. Can interrupt, use pets, damage, degens.
Monks are set apart really. Purely team support class, but rewarding and essential to a team. You rely on hench and heroes to take care of business, so not a favorite to start with.
Warriors good starter class. Does what you expect, melee, and tanking. Can take punishment and dish some out too.