This error will appear if the check was expecting to get a WishList Member Version number in the response but received something else instead.
Access being denied to the Activation and Update Center can happen if your server/hosting provider is blocking requests to the WishList Member licensing server.
If this is the case, you would need to request the server/hosting provider to configure their firewall to allow access to the Activation and Update Center.
Here is the information that will be required by the server/hosting provider in order to accomplish this request:
wishlistactivation.com – 18.104.22.168
wishlistproducts.com – 22.214.171.124
Port : 80
File Requesting Access : wishlist-member/wpm.php
Purpose of Connection : Software License Activation
Note the server/hosting provider will allow need to allow the following:
Purpose of Connection: Checking for latest WishList Member version and allowing it to be shown on the WishList Dashboard. A link will be displayed for a newer version of WishList Member if one is available.
Purpose of Connection: Getting latest WishList Member news tp display in WishList Dashboard.