Install TWS 4.0- Installed Version on your computer or convert from TWS 3.0 to TWS 4.0-Installed Version.
	Upgrade your TWS 4.0 to the latest TWS 4.0- Installed version. Do not use this to convert from TWS 3.0 to TWS 4.0.
View the most current Release Notes for the TWS 4.0.

Note: To successfully install the IB Trader Workstation on your PC, your operating system must have the free Java software plug-in.

Download the free Java plug-in from the Java website.