Hello Michael, welcome to the Greenbone Community!
The option to download compliance reports is only available for users of our Greenbone Security Feed, which is included in our commercial line of appliances.
You may still view the latest report details in the web interface however. For this click the corresponding date in the “Report” column.
If you want to test our full compliance feature set, please contact us at https://www.greenbone.net/en/testnow/ and request a 14-day test key for free. Please also use the GSM TRIAL appliance from the same page for testing, as we currently do not offer commercial features for the Greenbone Source Edition!