Download filezilla or use IIS ftp server, your choice. Make a folder in C:\ named SRO_CREST and make another folder in it called SRO_CREST (worked for me).
I used filezilla so open it, make a ftp account and make sure it got all rights and
home directory is set to SRO_CREST.
Make sure it's right ftp settings in server.cfg (in the shardmanager section)
Make sure type.txt in media.pk2 has all the right settings.
If it doesn't help you there are various guides in the guide section which will help you.
Also, this is the right section