Jaspersoft customers will be able to download the hot fix from the TIBCO Support Customer Portal Web UI using their username and password for the TIBCO Support Web page.
Once logged on they can find the hot fix under the Download Menu:
AvailableDownloads/Jaspersoft/JasperReports Server/7.9.0/hotfix_JRSPro7.9.0_cumulative_20210517_0750.zip
Direct download link: https://support.tibco.com/s/hotfixes?id=a012L00000QIuuvQAD
For instructions on how can TIBCO customers download / access all GA hotfixes, refer to Article 000022290: https://support.tibco.com/s/article/hotfix.
For a summary of the updates included, please refer to the attached README file (also included inside the ZIP archive).