As per the EULA, it is permitted to proceed to “the installation on a second computer owned by you for your exclusive use with the express condition that this second copy is not used simultaneously with the main one”.
为了方便，可以安装在自己的第二台笔记本上，但两个播放器不能同时使用。
To transfer Audirvana Plus from one Mac to another, you need first to uninstall it from the old one:
Use the De-authorize computer command of the Audirvana Plus menu
Delete the application file
Then you install Audirvana Plus on the new Mac as you did on the old one (installing the trial version, then entering your license key)
In addition, for your information, per the license contract, it is permitted to proceed to “the installation on a second computer owned by you for your exclusive use with the express condition that this second copy is not used simultaneously with the main one”.