I'm running into the same issue, sort of. I download the flip workflow, unarchive it but archive it back, and it cannot open the workflow anymore. The reason I'm unarchiving and archiving it back is to see if this problem is just with my package or something else. I remember this working before - I'd take a folder, archive it, rename it to foo.alfredworkflow, double click it and it would work, not anymore. What changed?