Actually the best way to update the current version to another is to read the last download topic. At the end of the topic it will say something like "f you're already using 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.8.1, or 4.9 just download 4.9.1 on the right and overwrite your .pdbs and .exes and run the migration tool!"
If the intersect version that your using is inside the sentence than you can update with the version onthe link else you will need to see at the previous link.