This computer cannot be activated due to license violation

It is not possible to reactivate the license eM Client on the computer. When I enter the key, I get the message “this computer cannot be activated due to license violation.”
Can you help me?

It depends what the violation is.

If you are using a Free license for business, it may have been disabled, and you would need to purchase a Pro License to continue using eM Client.

But i don’t. I use it for 1 email (not 2) address at home.