hi want to install 10.11. os on my laptop

Check to make sure your applications are compatible. PowerPC applications are no longer supported after 10.6.

Application Compatibility

El Capitan 10.11 Compatibility information

macOS Sierra 10.12: Compatible Apps

Also check to make sure there is a compatible driver for your printer.

Do a backup before installing, preferable 2 backups on 2 different drives.

amulya1415 wrote:

i want to install 10.11. os on my laptop

How to upgrade to OS X El Capitan - Apple Support