After purchase you get license key. You need to activate control via this method before using it.

procedure SetLicenseKey(LicenseKey: WideString);

__fastcall SetLicenseKey(BSTR LicenseKey);

public SetLicenseKey(String LicenseKey);

Public Sub SetLicenseKey(LicenseKey As String)

public SetLicenseKey(string LicenseKey);

SetLicenseKey(BSTR LicenseKey);

SetLicenseKey

public SetLicenseKey($LicenseKey);