I have lost my Second Activation!

We are aware, that Pixologic allows multiple activations of a single licence.

This is to allow 1 user to swap between machines (such as home and office, or PC and laptop) and was not for concurrent use, as per their FAQ ;

Can I install my software on more than one computer?  

With MyMaxon ZBrush licences, the software can be installed on as many machines as is required and the licence transferred to the machine that you wish to work on.

Please see the FAQ - How do I use my license on a different computer?