Enable Legacy Mode in Joomla

[lifewire]

hi
i have problem regarding upload and install the package of Joomla. i am getting error message Direct Access to this location is not allowed also Must Enable Legacy Mode In Global Config To Complete This Task. its working unpredictably i have tried 1.0 also reinstalling plenty of time but problems not solve can any help me ?
thank you

[opaper]

Legacy mode in Joomla 1.5.x is required to install Joomla 1.0.x plugins, and extension.

1. Login to Joomla Administrator Section
   
2. Click on Extensions > Plugin Manager
   
3. Look for "System - Legacy", check off the check box and then click on "Enable" from the top right menu.

[Modifier]

• Login to Joomla 1.5 Site Administrator panel (http://www.domain. com/administrator).
• check extensions in the main horizontal menu, then click on Plugin Manager.
  
• Locate plugin named System - Legacy, and then click on the check box in front of it.
• Click on Enable button.
  
• Ensure that Legacy: 1.0 status appears on the top right corner, and the Enabled column for “System - Legacy” is ticked. The Legacy Mode has been enabled.