Summary: Select "Activate from another computer" and activate manually.
You receive the following message:
You've exceeded the maximum number of activations for this serial number
Reactivating your copy of Acronis True Image 2014 or moving the installation to a different machine
What should be checked if an Acronis Home product does not accept serial number
Owners of Acronis True Image 2018 Upgrade licenses may notice the following message after entering the serial number for an old version of Acronis True Image:
"This number corresponds to other Acronis product, not Acronis True Image 2018"