Quite an important question!

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T
Thompers
Ascalonian Squire
#1
If i have a username can i download guildwars, factions, or nightfall or and play them on that username
E
EntityMaster
Ascalonian Squire
#2
If you have a user name and password and the corresponding account has stored valid CD-keys for those campaigns, yes you may just download the client from GW website and play via entering that account information.