@Stephen: you must still be on the older revision, is that correct? Try to upgrade first. Go to EC2 console > Snapshots > Change the viewing to Private Snapshots. You should see an EBS snapshot with "SAP HANA One Dev Edition Rev 48 update" in the description. Click "Create" button. Afterwards, please follow this blog and start from Step 2 directly to proceed with the upgrade.
@Iwan: see above 
. Yes, only the latest revision has all the UI5 package preinstalled.
Best,
Rocky