If anyone is interested in getting rid of those disgusting Corel popup ads, after 2 days of going round and round with Corel tech support,
this seems to be the fix. I have tried it and it is working so far.
https://corel.zendesk.com/attachments/token/8eYraZ19ApTV9qEepg0uyRCNl/?name=DisableCHUForAllProducts.reg
Enjoy,
Bob
A simpler way seems to be to delete the Corel\CUH folder, the fucking Corel Update Helper.