This is your best bet if you want to get up and running quickly without any issues. If you want the cutting edge, click the above tab for a development build.file_downloadDownload For All Platforms
Note that these are automated "bleeding-edge" versions - they are probably stable enough, but may break at any time! Recommended only if you want to try new features, and don't mind occasional bugs.
For now, this is the version that has TI-Basic "debugging", "USB transfers" (i.e. being able to transfers files such as OSes and apps), etc.file_downloadDownload For All Platforms