Unable to select WEBGL build

Dear All,

I own a Unity Pro ver 5.3 and trying to select Web GL as the target build, however I was not able to do it as the switch platform button is greyed (disable).

Do I need to purchase additional module to enable it … I was from the old Unity license plan and intended to stay with the plan as long as possible.

Thank you.

Kind regards,

Did you select WebGL as a build target when you installed Unity? If not, http://forum.unity3d.com/threads/missing-a-module-just-reopen-the-download-assistant.378077/