How to download and activate license for air gapped on-prem installation

There are 4 steps that need to be done:

1. use this commands for air-gapped installations instana license download -k ${salesKey} on a internet box
2. copy downloaded license ID and paste it into the license file on your air gapped machine
3. import this license on the air-gapped box by running command instana license import -f /{path/to/license}​
4. run command instana license verify to verify your license