Solved Errors when updating to Kunena 4.0.9

I am very new to Kunena and have a client who uses the extension. I just tried upgrading a client's Kunena extension and got this error message:

Gateway Time-Out
The gateway did not receive a timely response from the upstream server or application.

But when I clicked the back button on the browser, I get a message the Kunena installed successfully. How can I determine if I have a complete, fully installed version of Kunena 4.0.9?

It's imperative that I get this website updated to the same version as my client's new website before attempting to migrate Kunena over to the new website.

Thank you for any help that might be out there today.

Additional information regarding my upgrade to Kunena 4.0.9.

The version of Kunena prior to the upgrade attempt was 4.0.7 and the site runs Joomla 3.4.8.

I think that's all the pertinent info needed, but not quite sure.

If you go to backend - components -kunena - on the right you see the version number

Yes, I see version 4.0.9 but wasn't sure everything installed correctly. In the time I posted this question and got your reply, I tried reinstalling 4.0.9 and everything appeared "normally". In other words, I believe I can close this issue and breathe a sigh of relief.

Now to find the proper forum for how to migrate Kunena 4.0.9 to 4.0.9 from one website to another.

Thank you for your reply!