"New engine version" message

English is not my native language; please excuse any errors on my part.

Sometimes I see the message “A new engine version is available”. Why? There is no versions to update.

Before a new version is released preview builds are added to the launcher for testing purposes. Currently a preview of 4.8 is available, which is what your launcher is indicating.

Thanks! But how to install preview build in the launcher? If I click “Add version”, I see 4.3.1 only.

Click on the arrow next to 4.3.1 to choose the version.

LOL. I’m stupid. Thank you!