Hi Michèle,

All the products of Reviversoft are easy to use and helps you to keep your PC up to date and secure.

For example, Driver Reviver will scan your PC to identify out of date and obsolete drivers. Driver Reviver can quickly and easily update these drivers to restore optimum performance to your PC and its hardware and extend its life.

Registry Reviver will scan your Windows registry for problems. Registry Reviver can repair, maintain and optimize your registry to restore optimum efficiency and effectiveness to it, and to your PC.

If you still don't want to use the services, I think you don't need to cancel your subscription as your license will remain active until its expiry date and it will not get auto renewed after that.

But if you are facing some issue for the product, you can contact the support team at the below link:

Support

A Support executive/representative will help you out in a timely manner.

I hope this helps.

Regards,
Lokesh