Unsure what to do. Upgraded every version fine until 4.0.9. Tried this attempting to go from 4.0.6 to 4.0.9. Made the MSIs ok, but when I ran it (win7-64) it said "To install this product, use the setup wizard.". Unsure what to do, tempted to hack the registry and remove pdn references, but I'd rather a more elegant tool instead. Anything around? Any better ideas? TIA UPDATE: This fixed it for me: http://forums.getpaint.net/index.php?/topic/692-install-update-or-uninstall-trouble-read-this/#entry2795 Use this tool to remove paint.net from the registry's install database, then it installed fine.