When activating SquaredUp you see:
"License already activated"
"Maximum activations reached"
Activation keys are normally valid for a limited number of activations.
Your Primary licence key can only be activated once. Your Primary licence should be used on the first server in your production environment.
If you are adding further SquaredUp servers to a multi-server / high availability environment you should use the Secondary licence key for each subsequent server (see Enabling High Availability) . The Primary licence should only be used for the first server in the deployment.
If you are using your v3 activation key on v4, please see How to migrate from SquaredUp for SCOM v3 to v4 for how to proceed.
If you uninstall and reinstall on the same server and you originally carried out an offline activation (as described in How to activate your licence (offline/manually))then you can reuse the same .bin file by browsing to http://SquaredUpServer/SquaredUpv4/InstallLicence (where SquaredUpServer is the name of the server where SquaredUp is installed). The .bin file cannot be used on a different server. A SquaredUp v2 .bin file will not work with SquaredUp v4.
For more information see How to activate your licence.
If you need any help please contact SquaredUp Support with the activation key.