Hi Mark,
Through Mango, you must update to 2.8.8 before it will let you update to the 3.x series. You will also need to delete the dashboards module before you can update to 3.4 I believe you can do a manual upgrade directly. You can follow the manual instructions here: https://help.infiniteautomation.com/how-to-upgrade-mango/ or you can download the enterprise bundle from the store https://store.infiniteautomation.com/core , unzip that in another directory and copy in your Mango/databases folder from the old Mango. Start it normally and test the upgrade. If you place a store bundle in your Mango/ directory with the name m2m2-core-x.y.z.zip (with proper x.y.z version number) then it will automatically extract the upgrade next time Mango [re]starts Yes you will need to update your license to have a licensed 3.x version of Mango. You could download it and try it out without the license, though. Just keep your old Mango installation handy.M