Make sure you have the WPFunnels license activated and it is not expired. Then follow the steps below.
Go to WPFunnels > License and click on Deactivate License.
Then, go to the Plugins tab and deactivate WPFunnels Pro.
Next, go to WPFunnels > Settings, move on to Advanced Settings and click on “Delete Transients”.
Then clear the browser and plugin cache.
Now, activate the plugins and activate the license key.
Clear the cache again.
Once you have done this, check after a couple of minutes and you should be getting the update option.