It’s very easy to change the computers / domains associated with your license key. You can do so either in the spreadsheet directly (to unlink a computer) or via your account page.
In the spreadsheet
Click on the “Manage License” button available in the Disclaimer Tab of the spreadsheet:
Then click on “Deactivate This Workbook“. This will unlink your license from the domain used to open the workbook and perform this action.
Attention: by deactivating the workbook, the spreadsheet will close automatically without saving. You will have to open it again (on the computer you wish to associate the spreadsheet with) in order to activate it using your existing license key.
In your Account Page
Go on your Orders page and then click on “License Manage” next to your order.
Then click on the “Deactivate” button next to your domain in order to dissociate the desired domain / computer from your key.
As a result, the domain (i.e. identified as your workbook key) will be removed. The spreadsheet is now ready to be open and activated on another computer (see question “How do I register my spreadsheet” for more details).
Note that, in addition to deactivating domains, you can also remove a license key altogether in order to generate a new one. When removing a license key, all domains associated with that license key will automatically be removed. Once a new key is generated, you can start associating new domains to that key.