Deactivating a license on a machine

I'm getting rid of one of my old computers and want to move my FEATool license to a new machine. How do I deactivate the license from the old machine and activate on the new machine?

If you still have access to your old machine you can use the "Deactivate License..." option from the "Help" menu of the toolbox GUI

https://featool.com/doc/quickstart#install_unreg

Or, if you cannot access your machine anymore please get in touch the contact form and select the "Licesing issue" from the subject options, provide the license id/email information and we will deactivate it manually.