I have Jira Portfolio 2.4 installed on a Digital Ocean droplet and I have seen emails saying 2.5 is available. I've searched around the various menu options but can't see how to upgrade. any help appreciated
Log in as Administrator in JIRA, navigate to the Admin section of your JIRA instance (not Portfolio), locate the 'Add-ons' section.
the quickest way to do this is just type g+g and in the dialog that appears type 'Manage add-ons'. It will bring you there right away.
In the list of your installed add-ons, locate 'Portfolio for JIRA' and click the blue update button:
An alternative would be to first download version 2.5 from the Atlassian Marketplace (located here) and upload it through the same Manage add-ons page. The first option will be quicker, though.
