Did you download the CDSEO Pro 7.1+ Beta version?
https://forum.x-cart.com/showpost.php?p=409658&postcount=20
If yes then most likely your host will have to double check their ioncube version. When we were upgrading to PHP 7.2 using cPanel we initially got ioncube errors and our host had to update to the newer 7.2 .so ioncube files. We assumed wrongly that the 7.2 files would automatically be there since ioncube was already selected when we turned on PHP 7.2 in cPanel.
We're running CDSEO Pro 7.1+ Beta and PHP 7.2 on 4.7.10 with no issues.