There are only 2 patch versions, because all parts EXCEPT the first use the second version of the Patch.
Like this:
Part 1 - Part 1 (V 0.16)
Part 2 - Part 2+3
Part 3 - Part 2+3
Part 4 - Part 2+3
Part 5 - Part 2+3
(...)
Part 9999999999 - Part 2+3
The reason for this is, Part 1 was coded in a different way. Since Part 2, the i-Patch relies on a Relationships file, instead of editing variables.
On the How To linked in my Sig, you are told that if you use KoGa3 Multi-Mod, you don't need to worry about the I-Patch, because it is already included. But, if, for whatever reason you don't want to use that Mod (very recommended) after Part 2, just keep that patch around, because it is overwritten after each update.
Peace