How do we upgrade the Struts version to the latest in Liferay 6.2 CE?
If you are thinking of updating the struts version for the Liferay OOTB Portlets, then I have some very bad news for you -- You can't.
For your own portlets I think you can use Struts-2.
Will it be possible to let us know your requirement, so that the community might be able to help with an alternative.