In order to create new files inside the installation folder, you need to have admin privileges to do so. So please, start the OS X VM, open the terminal and run the following commands
chmod 777 /opt/bitnami/temp
Then you can mount the volume of the VM and copy the .sql file inside the temp directory. In order to run the MySQL command, you'll need to run this one
mysql -u root -p bitnami_redmine < /opt/bitnami/temp/backup.sql
Happy to help!
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