Resolution for error: Vital Product Data registry is in use…
When downgrading from Mobile SDK SP09 to SP08 to check some partner’s code, I encountered the following error message:
“The Vital Product Data registry is in use by another installer. Please start this installer after the other installation is finished.”
Check if this file exists: “~/Installshield/Universal/SMPClient/instance.running”, remove it, and try installer again.