1). Copy the Wakfu folder containing its files to another location.(e.g. from C:/program files/ to D:/).
2). Download the Wakfu setup from site (approx. 6mb).
3). Run the setup on newly copied Wakfu folder(which in this instance is in D:/).
4). After installation, execute the Wakfu file from that folder.
5). Let the updater do its work until it shows "Play". Then change the region to Western.
This way u'll have different Wakfus to run on Asia-Pacific and Western(So no need to change regions anymore) which u can use simultaneously, if needed.
Hope this helps.
P.S.: Hey Roxie, Blaze here