Yes, I've checked the tmp.exe file, it said Reflector.Install.
I thought it was a virus, because my company's computer has McAfee and it report the program every minute, untill I killed and deleted the tmp.exe.
Anyway, I think it is not good to force users to update. At least, it should not delete itself. As a software developer, it is only software I know which delete itself without any warnning.
Thank you Alex.