Yer need to download the update from slsk.com(or somat like that.Google it)
Its called 145 or somat.Then run it without uninstalling your present copy of soulseek.Dont have it running tho'.
Then yer back.
Had the same prob meself apparently the old ones not being supported anymore or somat.
Anyway its freemans , so might as well get it anway!
Nowthen.