The core rulebook pdfs always have the latest changes that have been incorporated to date. That does not mean, however, that they have all available errata. Here's how errata releases work:
Errata v#.#
The first number is what release of the book it relates to. So TacOps Errata v3.0 is all the errata that is included in the third release of TacOps (the version you have).
The second number, if higher than 0, is for errata releases not yet reflected in print. So, any release marked v3.1 or higher are releases with new errata not found in any current printing of TacOps. When a fourth release of Tactical Operations comes out (if it does), you'll see TacOps errata v4.0, and then everything in the errata to that point will be reflected in the fourth TacOps PDF release.
You can check the website proper (i.e. not the forums) and see what all the current errata releases are for the main rulebooks.