I experience the same problem using the installation page or through artisan.
'Could not connect to the database' which I am 100% sure the connection details are correct.
I think it is something to do with missing driver looking at the reply returned when using the php artisan method
> php artisan microweber:install firstname.lastname@example.org alain xxxxxxxx 127.0.0.1 microweber root mysqlz
Preparing to install
Error: Could not connect to the database. Please check your configuration. could not find driver