i havent done much research on sv_downloadurl so it could be that but from my knowledge sounds like you installed a plugin or 2 that required sound files and you didnt put those sound files in the right spot sound/misc/wickedsick.wav that needs to go in sound/misc folder...so you need to look at all your plugins and figure out which need sound...the plugins you downloaded should have came with sound some plugins on here have a get source get plugin then and extra zip folder and that is where the sound files would be. so try looking so some zip folders with the plugins you have