Stable build for Dropbox version 1..6.4 has been released for Windows, Mac and Linux and available for download. This version fixes memory leak in Mac and autoupdate issue on XP and includes fixes to some other bugs. You can install this build over 1.6.3 version manually or wait for automatic upgrade to take over.

What’s new in Dropbox 1.6.4

  • Fixes memory leak in Mac when downloading lots of files.
  • Fixes autoupdate not working sometimes on Windows XP

Download Dropbox 1.6.4 from below links

You need to point your mouse pointer over Dropbox icon on system tray to know the current version installed on your Computer.

Source: Dropbox forums