Before you can use blueprints from vRealize Automation 6.x in vRealize Automation 8, you must first migrate them to vRealize Automation 7.4, 7.5, or 7.6.
After the migrating the blueprints to vRealize Automation 7, they are marked as 'Not Ready - blueprint is using Create workflow' after running a migration assessment. If the blueprint does not use the create workflow, you must open the blueprint in your source environment and save it without making any changes and rerun the migration assessment. After rerunning the assessment, the blueprint is marked as Ready. If the blueprint does use the create workflow, it cannot be migrated to vRealize Automation 8.