Re-install on the same device.  No software deactivation required if you do not change any hardware, OS and/or username on your device. Otherwise, you must deactivate the software (Start>Captain Sim>777 ACE [2020]>Deactivate) BEFORE making any changes to the device.

TRANSFER TO ANOTHER DEVICE.  You may uninstall the software and install it on another device for your use. You may not do so to share this license between devices. You must deactivate the software (Start>Captain Sim>777 ACE [2020]>Deactivate) on your first device before transfer to another device.