Check the TWS Release Notes page to see dates of the latest production releases. If you are using the online version of TWS, each time you log in you will be using the most recent release of the TWS version you are using. You can change your version of TWS from beta to Latest to Stable at any time using the More options link in the bottom left corner of the TWS login box to expand available offerings. Choose a version in the Version drop down list and then click Apply & Restart.
How will I know when a new TWS version has been released?
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How do I switch to a different version of TWS?
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Is my TWS the online or offline version?