can't install 2.3

I can’t seem to install 2.3. I download it, ‘run’ it, and a window comes up saying the security certificate is not valid. I run it anyway, but nothing happens. Scrivener is not installed, and the files don’t seem to have downloaded. Any suggestions?

Kelly

Installed now, no longer says the security certificate thing.

When I open it, it still says its going to expire 15th May, not 30th like the download page says. But when I check ‘about’ it is version 023 so should be OK.