Last night downloaded and installed new 2018 SW. Doesn't launch! Not even a message about why it can't launch.  Just a dead icon.

I have been using the pre-release 2018 for a few months with no problem, but yesterday when launching got a message saying that its time had expired.  So I went and downloaded and installed 2018.

My current license goes until Nov 2018.

Help! Got work to do!

Thanks-

tpwhiteco