Please follow the below guide :
1.Please click the below link https://dn1.microbe.com.au/ESET/support/installers/noreseller_eset_internet_security_live_installer.exe
2. Once it's downloaded double check the installer > during the installation you’ll see the below screen, select ‘Skip login’.
3. After skipping login you’ll be asked to activate, select ‘use a purchased activation key’.
Activation key :