download this first
(its the sw2 client)
then download sw1 part1 update from here
now do this:
1. extract sw2 client to somewhere
2. extract sw1 part1 somewhere
3. copy sw1 part1 to the sw2 client folder if it asks to overwrite click yes to all
4. now start silkroad.exe (NOT SRO_client.exe) and have fun playing..