The patch is available on Steam and provides fixes for a plethora of known (and deeply hated) issues. The complete list of fixes includes:

– Fixed Alt-Tab issue which prevents players from switching away from a fullscreen window
– Fixed text rendering for certain resolutions
– Fixed localized font overrun issues
– Fixed a variety of crash and memory leak issues
– Fixed a variety of multiplayer client lock
– Fixed trade nodes for those nations with resource in home region which caused unprofitable trade theatre routes eg: Sweden and Marathas

The updates will be applied automatically when your Steam client is restarted.