Scribus 126.96.36.199 is in the VL repository under /extra. You may have to add that directory to your /etc/slapt-get/slapt-getrc file. As root add this line:
Then run gslapt, search for Scribus, and have gslapt install it.
Scribus 188.8.131.52 is not the latest version. The latest stable version is 184.108.40.206, which is not in our repositories. You can download a package for 220.127.116.11 from linuxpackages.net, but I don't know how it handles dependencies. Or you can compile 18.104.22.168 from source code.