Upgrade Sugar Open Source
Sugar v1.5 to Sugar v2.5 

1. Backup your v2.0.1 database.
2. Run the SQL upgrade script in order to upgrade the database to the 2.5 schema.
    If you are using v1.5d, run:
      - 1.5d-2.0_open_db_upgrade.sql script 
    Otherwise, run:
      - 1.5-2.0_open_db_upgrade.sql
    Then run:
      - 2.0.x-2.5_open_db_upgrade.sql
    
3. Unzip the 2.5 application into your Sugar web root
4. Run the installer by going to http://<your_machine>/<sugarcrm_root>/install.php and point your system to the upgraded database
5. Rename ore remove your <sugarcrm_root>/install/ directory for security purposes
6. Remove write permissions to your config.php file for security purposes
7. Log into the application with an admin account
 
You have now successfully upgraded to Sugar Sales 2.0  Enjoy!