When I started Vegas 18 a few days ago a message appeared saying there is a major upgrade and did I want to install it. I answered yes. The program went through a download and then closed and when it reopened I got the same message and it just keeps downloading the file and never installs it. I have tried rebooting the computer, Windows 10 Professional, and it just keeps offering to download the upgrade, but never installs. it. I've tried all the options offered and nothing works.