First download the software you want to install on your computer :
Connect the Kindle Fire into your computer via an usb's cable, it will be mounted as an usb device automatically once connected.
Copy bundled software install files or download from the Internet , the default file format is . APK into the Kindle Fire' folder and then disconnect the usb cable.
On the Kindle Fire into : Settings - > Device - > Allow Installation Of Applications section switch to ON
On the Home screen and then select the menu Run Apps Quickoffice software ( If the first boot will ask you to register , you can enter the email and sign up or ignored by selecting "Register later " ) and select the Browse icon .
In the next screen you select the " Internal storage " .
Then the screen will display the data in computer memory finds the file you just copied into the software , click on it to start the installation .
The display will show the message " Install " and " Cancel " . You choose the " Install " to install it .
After installation is complete you select " Done " .
All games and applications after installation menu will be in the " Apps " screen in " Home " .
Artwork : Kindle Fire software instruction
Above is how to install the software for the Kindle Fire without rooting , wish you success .
Guide on How to install software on kindle fire without rooting