Hi! Today I received my MacBook Pro Mid 2015 (macOS High Sierra) from the service - this is a new motherboard and a new serial number inside of course ... I think this is the reason for the message Registration Error: The activation code is not valid when I try to open the program SoundForge Pro 3.0.0 (Build 100) on my MacBook Pro Mid 2015 (macOS High Sierra), on which it was already installed and activated. The hard disk was not damaged. No updates occurred during this time except for changing the motherboard and battery. The SoundForge Pro 3.0.0 (Build 100) works without problems on my second computer iMac Late 2013 - the license allows me to use the audio editor on two devices. Thanks for attention! I will be glad to any answer. Alexey