The installers will set up litestep to work with OTS2 themes, including setting it as a shell and all the other tedium.

You can get just the binaries, but they no longer include previously "core" modules:
http://www.shellfront.org/shells/litestep/
http://leaf.terica.net/litestep.html
(currently the most recent version is 0.24.7 RC1)

If you just want to manually update modules, try the module archives:
http://www.loose-screws.com/modules.php?cat=0
http://www.shellfront.org/module-list.php

The new theme standard, OTS2, is documented at:
http://o-t-s.sourceforge.net/