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The BiG World Fixpack includes the patches required to install SCS v30 on EE 2.0+ and also K4thos' EET compatibility patches. It also includes a patch from someone else that presumably makes the arrows component (that you had trouble with) work again, although I haven't tested it. This is the basic set of fixes that everyone will get when they apply the Fixpack to a baseline SCS v30.
The BiG World Fixpack also includes kreso's latest Revised SCS (Spell Revisions compatibility) patches, automatically applied as an addition to the previous -- if Spell Revisions' folder (spell_rev) is present in the game folder when you run the Fixpack script. (So remember to unpack both SCS and Spell Revisions into your game folder before running the Fixpack script, if you plan to install Spell Revisions later).
I suggest reading this post for usage information: http://gibberlings3.net/forums/index.php?showtopic=27741&page=33#entry248962
The BiG World Fixpack is hosted on GitHub here: https://github.com/BiGWorldProject/BiG-World-Fixpack/
And it can be downloaded (direct link) here: https://github.com/BiGWorldProject/BiG-World-Fixpack/archive/master.zip