Hello,
It was successful, not so straight forward but it works.
1. Run this: /usr/local/centovacast/sbin/update --add shoutcast1
2. Since it's a 32-bit servers app on 64-bit server, I installed:
# yum install glibc.i686
Afterward, from Centova Cast interface I could create user with Shoutcast v.1 instance.
One more thing that I didn't know, in order to connect on Shoutcast v.1 via winamp plugin Nullsoct SHOUTcast source 2.3.2, DJ/User Id shall be blank, only password is necessary.
So, thanks people here for help.