To request a trial license go to https://www.nvidia.com/en-us/clara/genomics/ and click on the "FREE 90-DAY TRIAL" button. You should receive two emails with additional instructions. One tells you how to log on to NGC, the other gives you a direct link to NGC (you'll need to be able to log in to NGC). Following the direct link will let you download the "parabricks_free_trial" resource, which will result in you downloading a file called "files.zip". The trial copy includes a license (license.bin) which, when installed, should be made readable for the user running Clara Parabricks.
Once you have downloaded files.zip, go through the following steps:
# Unzip the downloaded file. This extracts parabricks.tar.gz from files.zip $ unzip files.zip
See Installing the Software for further instructions.