Hello,
for some reasons sometimes you bought a new computer.

Maybe I'm blind - or there is no way to manage the license or amount of licenses / machines.
At current I use one computer, but activation says I got two in use.

So I want to delete one machine.

Hi,

There is no way to reset the activation counter, but there is no need to worry about it. Under normal use (and bare in mind you are allowed to install on any number of computers that you own) you will not hit a limit. We count and show the number of installations for you to detect if your registration has been stolen and for our system to monitor excessive installations that could be in violation of the license terms.

And for the record; we have never terminated a license without trying to contact the owner to sort out what could have happened.