I decided to get a local WP server working on my Mac for local development and learning purposes.
I am using the built in Apache server and I manually installed and configured the MYSQL database etc.
After some work I have WP working and next I needed to install the WPMU DEV Dashboard.
I downloaded the zip and installed the plugin - got all the way to logging into the MPMU server, then got the error message as per the screen shot shown.
Obviously I need some further setup of PHP, but could not find out how to do that and the error message only suggested I need to enable certificate verification - not sure what is needed there.
I don't know if it is just an addition to the .ini file, or something else.
Update: OK, so now I have made some possibly dubious progress - I added the following 2 lines to my WP-config.php file:
define( 'WPMUDEV_APIKEY', 'YOUR-API-KEY');
The first line did not seem to do anything, but the second seemed to get me past the login screen.
But now it thinks I am a free member, so obviously I have still to be able to log in using my credentials,
so I suspect I am still at the same issue, but I thought I would let you know what happened from the above changes.
Will wait for your reply before trying anything else.
Could you please assist?