Managed Package installation instructions here:
https://help.sql-sales.com/en/articles/9606814-managed-package-installation
Download SQL-Sales software here:
https://sql-sales.com/download/sql-sales.zip
Full setup instructions here:
https://help.sql-sales.com/en/collections/4805161-setup
Alternatively, full pdf documentation
https://sql-sales.com/download/sql-sales-guide-pdf