Here you can download the package. A free version and a pro version is available as well as a beta version.
If you are interested in the differences between the free and the pro version, take a look at this page.

The changelog can be found here

Pro Version

If you have purchased the pro version of the package, enter the invoice number if you bought it through the Unity Asset Store or the or the serial number (which you should have received in an email) if you have bought it on this site.
After you have submitted the form, the download button for the pro version will become enabled. Note that it might take some time to load. Please be patient.

Free Version

Free version of the project. Slightly more limited than the pro version, but still very powerful. Go ahead and try it out!
Includes several example scenes showing how to use the system.

Download (version: 4.1.12, last updated: 27 Feb 2018 (last month))

Pro Version

Pro version with more features than the free version. Includes among other things automatic navmesh calculation, specialized path types and layered grid graphs. See the free vs pro comparison page for more info about the differences.

Version 4.1 is a larger update with a few breaking changes (listed in the changelog). If you are upgrading from an earlier version I recommend that you create a backup of your project (or use version control).

You can find the changelog here

Requires Pro (version: 4.1.12, last updated: 27 Feb 2018 (last month))

Free Version (3.x)

Latest 3.x free version.

Download (version: 3.8.12, last updated: 14 Dec 2017)

Pro Version (3.x)

Latest 3.x pro version.

3.x will continue to get bugfix updates and some smaller new features for a time as not everyone can or want to upgrade.

The 3.x branch changelog and documentation can be found here

Requires Pro (version: 3.8.12, last updated: 14 Dec 2017)

4.1 Beta (free)

You can find the documentation here.

Download (version: 4.1.13, last updated: 06 Mar 2018 (last month))

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The A* Pathfinding Project works with Unity 5.2 and up.

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