Glad you got it working! For future reference, V8Update's output should look something like this:
C:\ClearScript>v8update
Build mode: Release
V8 revision: Tested (3.30.33.16)
Creating build directory ...
Downloading V8 ...
Patching V8 ...
Downloading GYP ...
Downloading Python ...
Downloading Cygwin ...
Creating patch file ...
Building 32-bit V8 ...
Building 64-bit V8 ...
Creating lib directory ...
Importing V8 libraries ...
Creating include directory ...
Importing V8 header files ...
Importing patch file ...
Succeeded!