help downloading US Postal Service USPS WooCommerce Shipping Plugin

Envato Code Canyon USPS WooCommerce Shipping Plugin

Just downloaded US Postal Service USPS WooCommerce Shipping Plugin for Rates and Tracking and I went to install it on my website staged at wp engine. I got a message Unpacking the package… Installing the plugin… Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘TransferOutBeforeUpgrade’ not found or invalid function name in /nas/content/staging/bestbrella/wp-includes/class-wp-hook.php on line 286 The package could not be installed. No valid plugins were found. Plugin installation failed. Return to Plugin Installer 'is this because I’m using a staged site? Or do I have to enter a license number before installing?

I then went back and downloaded the license info.

Tried again, same problem

a) make sure you are only trying to install the actual plugin and NOT the entire download from CodeCanyon

if that’s not the issue then

b) reach out to the author

it’s a top-rated plugin so sure there is a basic fix