OpenVAS Version: OpenVAS 9 Community Edition, Greenbone OS 4.1.7
I am using OpenVAS appliance installed in Hyper-V virtual machine.
I have scanned my network and got the results. I'am able to view the scan results, but I couldn't download the report in any format (like PDF, XML etc). There is no option to select the format also. It shows, No results found.
The GSM Community Edition was released in a new version 4.2 and now includes the report formats again as announced:
One noteworthy bugfix: In GCE 4.1 the report plugins were missing and now are back.
Disclaimer: Answer of a NVT Developer @ Greenbone