You’ll need to create an empty database with username and password. Create a password without special characters. You’ll be inputting this as part of the install. You’ll also create the first user.
Password fields show as empty.. so can be difficult to know if you've pasted in the password correctly.
Create a new site called myshop:
php composer create-project aimeos/aimeos myshop
This will set up a demo site automatically for you.. so will finish off with the correct migrations.