OAK has a 30-day trial period in which it can be evaluated. During this time, it will function fully, reminding the user once per session. When the trial period is up, the only part of OAK that will work is the part that takes licence details.
Licensing is performed on the Licence Information window, which is accessed by going to the Help group in either of the OAK ribbon tabs, and clicking the "Licence Information" item under the Operis menu.
The Licence Information window looks like this:
If you do not wish to enter a licence key, click "Buy Later" to continue.
Licences can be purchased by contacting Operis using the contact details on the form, or online by clicking the "Purchase" button. You will need the product ID that is visible on the Licence Information window. This can be selected and copied to the clipboard.
When the licence key has been obtained, it can be entered in the Licence Key text box in the Licence Information window.
Click "Enter Key" to enter the licence key into OAK
At this point, users of recent Windows versions might see a User Account Control (UAC) dialog:
Simply click "Continue" to continue.
If the key is accepted, a message box should appear as follows.
Licences that functioned for OAK 3 will not work with OAK 4.