You will have to reinstall it using whatever medium you first used. Any files you've created can be transferred via a thumb drive or whatever.
Hi, Craig is correct, you can either download Aeon Timeline from our website at: https://www.aeontimeline.com/download/ and enter your license code, or if you purchased from the Mac App Store you can go into the App Store and download it again via the purchased items tab. You can then copy all your timeline files onto your new computer using usb etc. If you need any more help with this, please email us at email@example.com Jess