All in one Event Calendar – You do not have sufficient permissions…

I’m trying to install All in One Event Calendar on a local machine, as I have done quite a few times before. But now, when I try and install it, I get an error page with “You do not have sufficient permissions to access this page.”

Once I’ve had that once, it will not allow me back on to the general plugins page – I get the same error. The file permissions are the same as they were for other installs, and the same as other plugins.

The page giving me this error is https://localhost/wp-admin/edit.php?post_type=ai1ec_event&page=all-in-one-event-calendar-install-themes and that’s the page I’m redirected to when I click on the ‘Plugins’ main menu item.

Any ideas? Has anyone else has problems with the most recent version of this plugin?