Your key is already used on two machines. You must deactivate one first.
If you have reached your license limit or are moving to a new computer, you must deactivate the old installation. Your key is already used on two machines
TechSmith Camtasia 2018 Activator: Activation & Licensing Guide for Windows/macOS a desktop and a laptop).
A single Camtasia license key can be used by the same user on up to two computers (e.g., a desktop and a laptop). Your key is already used on two machines