If you purchased djay from the Mac App Store:
There is no need to de-activate. Simply download djay on your new Mac from the Mac App Store using the same Apple ID that was used for purchasing djay.
If you bought djay through our online store:
On your old Mac, select “De-Activate” from the djay menu and authenticate with your admin password. This will de-activate the license, and show your license key for you to write down.
On your new Mac, download djay or install it from your CD. Then activate it with your license key.
Note: To transfer Metadata from your old Mac follow this guide.